[ The dangle of Naruto's arm puts a gap between their palms where their fingers remained linked, and where Naruto sets his elbows on the edge of the hotspring Sasuke lets his own arm dip back into the water, his hand held above the surface by Naruto's own. ]

Yeah. [ It isn't how Sasuke would have explained it, but that's why he let Naruto come to his own conclusion. ] When you use that ability of yours, it takes up almost all of your mana. You haven't experienced the in between, only full or empty.