Billy's been called worse, and after living most of his life hearing belittling insults from the Americans who couldn't forgive him for being different, he's developed some thick skin. It's why he simply lowers his hands in favor of crossing his arms.

"Believe me, I'm not entirely unscathed. It's just that my changes aren't of the physical kind, but that doesn't make them any less convenient." His voice is still calm, but he's standing his ground.

He can't prove it beyond a doubt, but Billy's suspicious the mist might have played a hand in all this, considering he'd been fine up until that point (and Ronan had looked normal). That's also when he started thinking about all the people he left behind again. Were Emma Cullen and the rest of them dead, too? He found that such questions were all he seemed to be able to think about now, but Billy had been taught from birth that men were supposed to be strong and stoic.