John flicks a smile at her, despite the pain in his face and the concern still twinging within his chest.

"You do strike quite a hard bargain," he replies. "Is... That allowed? Not that I am ungrateful for the invitation, but." He palms the pendant hanging around his neck. "I was under the impression that these only worked to get us there and back."

Even as he questions Claire's words, he reaches tentatively for the cloth tied around his head. Hesitating for a moment before he loosens it -- she is a doctor. She's likely seen far worse than this. That is, he would hope so. He'd hate to think otherwise.