Goku rolled a 20 on persuasion and had convinced Vegeta to stop pretending to be an edgelord. He does care about his family after all! He probably even likes Goku, he knocks him out CLEARLY because he doesn't want to get hurt...
Anyway, the pink boxing ball we call Majin Buu wasn't a boxing ball at all and was unkillable. So Vegeta decided to take him apart atom by atom, but this is DBZ, faster than the speed of light is attainable, why wouldn't you have smaller chemicals than atoms either? Vegeta died for nothing, but at least it was a cool moment. Now Goku needs to flex his real strength and hold Buu off.
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