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

Guy 1: hey why did Constantine teleport is that his magic?

Guy 2: Nope, that's Ball-kick paradox. Instead of looping his existence back and forth the timeline just decided to prevent him from doing that

Guy 1: he tried to sterilize his dad to kill him? Extremely chaotic way to commit not alive lol

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Ball kicks

A soccer move found in Norway, where a person kicks a ball with a foot. This move can be done with both feet and if the ball lands in the goal everybody yells JA!

Hans did a ball kick

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