Oh. OH! That was... Donna really wasn't expecting that. One minute they were exploring like the good old days and the next the Doctor was puking up all other the place. Come to think of it, Donna struggled to think of a single time the Doctor had been sick. Had she ever seen him vomit before? Her memory was a little fuzzy at best, but she can't recall a time off the top of her head - detoxing, sure, but actual puke? Not so much.

"Okay, that's not good. Come on, Spaceman!" She rested a hand on the small of his back, rubbing. "Deep breaths. Uh... back away from the vomit and sit with your head between your legs!"