Horrifying to Seifer maybe. Squall would have found the whole affair rather amusing, if only because of Seifer's reaction to it.

He didn't bother actually replying to Seifer's comment, though, choosing instead to to give him a pointed look (this one meaning approximately 'I know that') before heading off in the general direction Selphie had vanished to. It would (hopefully) be easier to talk to her without Seifer hanging around.

As an afterthough, he sent a Cure Seifer's way before vanishing into the trees.