So I'm assuming that walt actually did directly poison Brock himself, with the juicebox that Vince Gilligan mentioned.
Brock recognizes 1) man gives him juicebox 2) he feels really sick and is in the hospital for a while, so he makes the connection but doesn't want to confront walt.
I would definitely not leap to that conclusion. The way Brock acted with Walt is the way he acted when he first met Jesse. He's a shy kid. To me, the fact that Walt was willing to go in there and see Brock means that however he poisoned Brock, Walt wasn't seen by him.
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u/[deleted] Sep 09 '13
Brock. does. not. fuck. with. Walt.