In a series full of murders, explosions, and cartel executions, many fans still point to one act as Walter White’s unforgivable sin: poisoning a little boy, Brock Cantillo. Brock doesn’t die, but that almost makes it worse. The poisoning isn’t about survival in the moment; it’s a calculated move in a long game of manipulation.
This is where Walter stops being a desperate man with cancer… and fully becomes a tyrant.

In season 4’s “End Times,” Brock suddenly falls gravely ill.
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