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Explained from DC's Legends of Tomorrow Season 4, Episode 3 when John Constantine tried to Ball-Kick his father in 1977, Ball-kick Paradox is the rule of temporal travel where you can't Kick your ancestor's balls or do anything that will directly or indirectly remove your existence from the timeline as that would mean you won't exist in the future which will then mean you never averted your birth in the first place. This in effect restrains you from doing anything that would erase yourself and will be teleported into the last place you were in before you tried to do such thing
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