It could possibly be due to speed, i.e. the slower the object is travelling the longer it takes (a parachute drop would travel slower than a rocket thingy?)
Up to the producers how they explain it really. Either that or we just settle for the catch-all explanation of "electromagnetism."
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So I started pushing the button too. And we saved the world together for a while, and that was lovely. Then Kelvin died, and now here I am all alone. The end.
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