About Gus walking away from the car, I don't think Gus saw Walt. I figured it was because Gus was thinking of his conversation with Jesse and realized that his plan to turn Jesse against Walt had failed, meaning Jesse had realized it was actually him that had poisoned the kid. If that's the case then Jesse may be planning revenge against Gus and he may be walking into a trap.
I also thought about the scenario that Walt had actually poisoned the kid to try and trick Jesse into thinking that Gus did it to bring him back to his side. If that's the case, Gus may have also come to that same conclusion when he heard the boy had been poisoned after thinking about who would poison the boy and why when walking back to his car.
Personally, I think Walt poisoned the kid and the second scenario is the correct one. I think we saw him snap last episode when he was laughing manically in the crawl space. I think that was the point of no return when Walt dies and Heisenburg takes over. Throughout the series we've seen Walt's ego, arrogance and ruthlessness slowly taking over his humility, morality and compassion. Every time he's had his back against the wall, he's taken increasingly ruthless actions. His back was really against the wall this time, and I think it may have had permanent repercussions.
I think the rest of the series will be Walt's slow decent into madness and his eventual capture by Hank. I've always hoped Hank would catch him in the end; it seems like such a natural ending for the show. Hank eventually putting the pieces together would be one of those big, dramatic, heart-stopping moments the show is so good at, and always hinting at that danger without ever realizing would seem, to me, to be a cop out.
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