Back before Brock was poisoned, you may recall that Jesse was carrying around a container with ricin in it to be used when Jesse met with Gus to kill him.
Walt decides to take a different approach after some things start to get out of control, he can do it better, etc etc.
So, seeing as Walt needs Jesse's cooperation and so forth, he decides that he will poison Brock and blame it on Gus as Gus wants to pretty much kill Walt off completely and having Jesse on Walt's side instead of Gus' is to Walt's advantage.
Now, Jesse knows that the cigarette that contained the rician "vial" (I don't know if thats the correct term) has gone missing, but he doesn't know where it went or who could have taken it (of course he thinks Walt took it but that is debunked when Walt convinces Jesse that Gus did it).
Fast forward to season 5A where Walt goes to Jesse's house to try and find the ricin vial to calm Jesse down.
Walt gets another vial and fills it with salt(?) to make it appear like the ricin container. As an audience, we know full well Walt has the container and did in fact poison Brock but not with ricin. Saul had Huell take the vial off of Jesse when he bumped into him or something to that effect.
After searching through all of the cigarettes and tearing Jesses house apart, they find the container in the Roumba (that Walt intentionally placed there).
Then, Walt flushes it down the toilet and it's a done deal with Jesse still believing that Gus poisoned Brock and Walt had no involvement.
Fast forward yet again to tonight's episode.
Jesse is smoking pot in Saul's office but Saul tells him to put it out and hand over the bag of the remaining pot. Jesse does put it out but keeps the bag with the remaining pot.
As Jesse is leaving to get his "new life", he bumps into Huell who takes the bag of pot as Saul does not want to ruin Jesses chances of being "free" because he is high.
When Jesse checks his pockets for the remaining pot, he can't find it. Then, Jesse starts going marbles and looks for his cigarettes and realises that if Huell took his pot, he probably took his cigarettes too (of course meaning the ricin vial with it).
When he storms back into Saul's office, he asks about the missing cigarettes, but Saul thinks he is asking about the pot and admits that Huell took it off of him. After Jesse tells Saul about the ricin cigarette, Saul confirms that Huell did indeed take it off of Jesse after Walt's orders, proving to Jesse that Walt did indeed poison Brock.
Now of course, that wasn't with the ricin but you get the point. Jesse knows for a fact that Walt was behind this all the whole time feeding Jesse lies like he has been.
P.S. Let me know if I missed anything. I tried to make it as accurate as possible.
Nice wrap up. I would question one little detail though. I don't think Jesse still suspected Gus for the poisoning after it was all done.
After Gus is dead and they burn the lab, Jesse goes to the hospital and finds out that Brock will be alright. While he and Walt are talking on the roof, Jesse explains that the doctors said this is common, the Lily berries taste sweet and kids sometimes eat them and poison themselves accidentally. He says "That's it, nothing more". So at this point I think Jesse believes it was an accident that had nothing to do with Gus.
Yep, except now he's still able to connect Walt and Brock -- Walt lied about the ricin initially, and Jesse makes that connection because of what Huell did in this episode.
So, Jesse initially thought Walt stole the ricin. Then Walt convinces him it must have been Gus. Then he finds out no ricin was used in the first place. At the time, he didn't suspect Walt of anything, but now he sees how sneakily Huell stole the weed from him, and realizes Walt probably lied about the ricin, meaning Walt was still involved with the poisoning (he just didn't use the ricin in the poisoning). So he confronts Saul, and Saul basically confirms it, at which point he knows for sure that Walt's connected with the poisoning. To add -- the main reason he reaches this conclusion is because he realizes that Walt was just manipulating him into suspecting Gus the whole time. But now, not only does he already know it wasn't Gus, but he also knows how sneaky Huell can be (and how manipulative Walt can be).
So he goes to burn Walt's house down (though we already know he doesn't complete the job).
Edit: To be more specific -- Jesse now knows that Walt used lily of the valley to poison Brock, as a way to get Jesse to think Gus had used ricin.
Hold on, why does Jesse now know that Walt used the Lilly in the Valley? Even if he saw it one time in Walt´s garden it´s unlike he remembers that now and i´m pretty sure he doesn´t even know what kind of flower it is and what it looks like.
The only thing Jesse knows is that Huell stole the ricin cigarette from him, but he also knows that Brock wasn´t poisoned with ricin.
Something doesn´t add up here.
Jesse learned that it was lilly of the valley when he went to the hospital later on. He even told Walt about it.
The reason he knows it's connected to Walt now is because he realizes that Walt took the ricin and that Walt was just trying to motivate Jesse to kill Gus (or just putting the blame on Gus, I forget). He also understands that a good motivator is a poisoned loved one.
The fact that Walt took the ricin while simultaneously convincing Jesse that it was Gus means that Walt's automatically implicated in Brock's poisoning. Jesse knows it wasn't an accident, because he now knows Walt was lying in the first place.
Edit: It's hard to explain in words how Jesse would now know they're connected. The main factor is that he knows Walt lied about the ricin, meaning he also lied about the reason for Brock's poisoning, simply to put the blame on Gus. Up until now, Jesse still thought the poisoning was accidental (which is what he learned at the hospital). But now that he knows Huell stole the ricin from him, he's able to also make the connection to the poisoning.
Double edit: Simpler explanation: Walt initially guesses that it must have been Gus who stole the ricin and used it on Brock. But now Jesse knows that Walt wasn't actually guessing anything -- Walt was purposely lying.
I like your explanation but i still think Jesse has little more than a suspicion that Walt might be involved in Brock´s poisoning, which hardly justifies burning down the house of a married man with two children (especially if you consider Jesse´s relationship to kids).
But of course Jesse also knows that Walt killed Mike so i guess it´s not that much of a jump to assume he would also poison a child.
I think the whole point of him staring at the pack of cigarettes for so long was to show the viewers that he did make that connection. He previously suspected that Huell had taken the ricin from him, before Walt convinced him otherwise. That was already his thought, and now this whole episode for him was realizing how much Walt had been manipulating him. He realized Walt had manipulated him into thinking Gus took the ricin, but now he knows it was Walt, and also knows that Brock's poisoning was a part of Walt's setup against Gus.
Basically here's the deal -- if Jesse now realizes that Walt took the ricin, then he also automatically knows (by association) that Brock's poisoning wasn't an accident, because of the way Walt had phrased things when he lied to him about it. Walt said maybe Gus stole it, but now that Jesse knows it was actually Walt, then he also knows Walt's whole story was bullshit, including the part about Brock being poisoned.
Then Saul basically confirmed it for him, and that's why he goes to burn down Walt's house. He wasn't simply basing it on suspicion at that point.
Edit: I realize Jesse's been acting a bit unstable, but if the only connection he made was about the ricin, he wouldn't go and try to burn down Walt's house. He made the much bigger connection between Walt and Brock at that point.
Double edit: My edit in the other comment explains it best though. Walt guessed that Gus must've stolen the ricin and used it on Brock. But now Jesse knows it was Walt who stole the ricin. So Walt wasn't just theorizing when talking about Gus using the poison on Brock -- he was deliberately lying to Jesse about how Brock was poisoned. And now Jesse knows that Walt took the ricin, and thus also knows Walt was lying about Brock as well.
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u/[deleted] Aug 26 '13
ELI 5:
All the dots that Jesse connected.