Upon his return even unseen Erik looks perhaps understandably wary, although it does help that he has a lead to follow up on. He'll do that in a little while, once he's done things like assess the situation here, the first order of which is uh, getting the chair off of the floor!

He does this with his mutation rather than hefting it with his arms (its return to upright position is smoother that way), and considers Charles with his arms folded over his chest. "You look better," he observes, which means ...you know, Charles looks less like he is about to start popping capillaries.

If it's occurred to Erik that if Charles were really angry he could leave Erik thinking he were, perhaps, a cocker spaniel for the rest of his life (it has), he seems to be ignoring the possibility out of bravery OR LOVE or deeply abiding stupidity. He's not sure which of those it is.