He nods and briefly rolls his eyes; he's had experience with the Doctor, too, not that the ones he's thinking about are anything the Doctor remembers now. It's not the time to poke, though.
"Right. I want to make sure nothing goes wrong for her because you get tired and drained-- or to you." He pulls over one of the medbay's computer setups so he can get his baselines on screen for Dr. Harper's use, then he works on hooking things up.