"Of course not," Childermass says, looking back around to frown at Lambert. It's almost offensive how he's gotten so much taller so suddenly, though he stays back far enough to be well out of range of that tail. "Why would I have?"

So he's a little worried about his dog, that doesn't mean anything. He's certainly not about to skip a late dinner — even if it's only a few things pocketed from the back of the kitchen — after a show. When he does magic for just himself, hiding from sight or experimenting with other shadows, it's not so draining. When he's managing what's basically one crowd-sized act of misdirection? That takes a lot. He's no powerhouse like Strange is and even the other magician has his own limits.