Julian's face holds no sign of deception. He's completely earnest in his offer, and he really does have very few ulterior motives. Those he does have, he thinks are positive enough, thanks. Maybe if he does something to help you, you'll think before going off the rails.

"Your ribs won't set themselves before they start healing. Best to get that seen to. I can also staunch the internal bleeding faster than your natural healing process. That's all." He's not going to scan you, he's not going to inject you with anything suspect. Just a simple offer of assistance, because he is a doctor and that is what he does, dammit.