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Message: <blockquote data-quote="occam" data-source="post: 3504663" data-attributes="member: 39815">The limits of time travelI think you've nailed it. Jumping back in time and removing Sylar as a threat before he ever becomes one invalidates a whole series of events, including events that would lead Hiro to jump back in time and remove Sylar as a threat. The paradox prevents this from working.Same with Charlie. If Hiro had successfully saved her life by jumping back in time, then he would've had no reason to jump back in time to save her. The timeline heals itself to a self-consistent state, and thus prevents action that leads to inconsistency, to paradox.Hiro's challenge was to find an action he could perform even if the results of that action changed the future. Going back in time to tell Peter to save the cheerleader is still something he can do in a timeline where Peter does indeed save the cheerleader and (hopefully) prevents the explosion. Peter just needs to remind Hiro to do that in five years. Despite the time travel, you still end up with a self-consistent timeline.Hiro cannot take an action in the past that, in the future, prevents him from taking that same action.</blockquote>