If he had his human eyes, they'd be watering--his abyssal ones, somewhat to his surprise, start to leak thin trails of black ichor down his face. He can't breathe, and he's starting to feel it, throat jerking as he instinctively tries to drag in breath around the obstruction. It doesn't make him panic, though, like perhaps it should, just makes him light-headed and glassy-eyed and pliant, letting Brighella move him however he wants.