pepper if gojo was on a piece of paper which is space and the world cutting slash cut the piece of paper in half then his upper body cannot fall down to the ground anymore because there is now a literal divide in space between his upper body and lower body, meaning in order for him to fall the divide has to be repaired, and if the world cutting slash is an infinitely thin slash, then literally nothing would happen to gojo, meaning it has some sort of width, and i think what happens is because space ends at gojos torso during the slash, his atoms at the edge of space have nothing to cling onto anymore so his top half moves whatever amount it moves whenever its not connected to his bottom half, and when space gets un-severed the alignment of his atoms is completley off now so he just falls apart

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