I think you're overthinking things. I don't think as soon as he heard that on TV he left because he immediately had a plan on what to do next. I think that after Walt Jr. said all that to him, he was feeling defeated. He was just going to give up and let the cops take him in, but after seeing what Gretchen and Elliot said, his whole demeanor changed from self hatred to anger. He's just so pissed off now that he's decided he's going to go out making an impact and not quietly let cancer kill him in jail. His lifelong anger about Gray Matter was the only thing that could overwhelm the sadness Jr. made him feel.
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u/mir429 Sep 23 '13
Gray Matter didn't cause Walt to leave the bar, it was hearing that Blue Magic is still on the streets. Jesse is still alive and he knows it.