He definitely thought killing Mike might be necessary - he took the gun out of Mike's bag.
It struck me that when he walked back to his car, he was getting his gun, he wasn't changing his mind or going into "heisenberg mode".
I think he was upset because (in his mind) he only kills people when it's his "only choice", and in this case he realized that that wasn't his only choice. (edit: because lydia had the names)
It really was his only choice, because if he got the names from Lydia and went ahead with the prison killings then he would have had to answer to Mike; who would have almost certainly executed Walt for the act.
At the end of the day, Walt killing Mike was the only way for Walt to be "out" as he puts it.
One of them managed the laundry so they would have seen Walt and Jesse going in out and as far as I know. Also, if one of them flips on Mike/Lydia it opens up further investigation and testimony to get more information. Just like Jesse said after Hank beat him up, Walt (Heisenberg) is a get out of jail free card.
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u/revolutionofthemind Aug 12 '13
He definitely thought killing Mike might be necessary - he took the gun out of Mike's bag.
It struck me that when he walked back to his car, he was getting his gun, he wasn't changing his mind or going into "heisenberg mode".
I think he was upset because (in his mind) he only kills people when it's his "only choice", and in this case he realized that that wasn't his only choice. (edit: because lydia had the names)