He still hasn't quite caught on for the reasons for her intense focus, and when she seems surprised by his touch - or even just his presence - his own concern sharpens from faint concern to outright worry.

"Are you alright?" he repeats, brow furrowing together more visibly than it had a few moments earlier. "You were just standing there staring at...I don't know what. Nothing, looked like."

Maybe she's hit her head on something. The Doctor'd been like that once, after he'd been concussed, seeming to lose his focus on his immediate surroundings and needing to be prodded to respond to something he'd been saying, and he catches his lower lip in his teeth, biting down for a moment as he glances up and tries to see if it looks like there's any cuts or bumps or anything that might look suspicious.

"You're not dizzy or anything, are you?"