Peter's vision what does it tell you?

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Talk about episode 11 "Fallout" Summary: The heroes struggle to come to terms with the Texas tragedy; more is learned about the nuclear bombing predicted in Isaac's painting; Matt and Audrey pursue a new lead in their hunt for Sylar; Niki makes a difficult decision, which will allow her to keep her family safe, and what is up with peter's vision? I'm still confused about it. Exactly why is Peter the one blowing up? I guess we'll just have to wait until next year!