The incoming breath attacks are, unfortunately, not something that Kuja is physically capable of simply taking. Magic collects around him, too slow to stop the Aqua Breath from smacking him out of the air but coalescing into a shimmering [Reflect] barrier just in time to nullify the following blaze. He's left sputtering, bruised, and completely soaked- but not burned to a crisp.

"Nnngh- why won't it just die already-" He's cut off, of course, by Red's Melody being unleashed, and now he's just impressed.