"Jesse is upset about the boy. I just need to explain to him why that had to happen." - Walter White. "Okay, but say, you know, just for the sake of argument, the kid's not in the mood for a nuanced discussion of the virtues of child poisoning." - Saul Goodman. Season 5, Episode 12. Even at the bitter end, Walt's still naive enough to think Jesse wants to hear justification for the poisoning of little Brock.