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That's what I was thinkingSeems like it just amps his cleaves when targeting the barrier between Sukuna and Megumi's soul. In the pages where he's doing the roundabout swapping and the page after it looks like he isn't punching Sukuna but just grabbing him, so he's using cleave obviously. It also doesn't look like he's taking any physical damage so the binding vow is probably just max damage to the barrier between their souls in exchange for no physical damage in contrast to his previous punches which did both. The fact Sukuna spits out his fingers and comments on the damage to that barrier makes it seem like that's what it is to me