He cares if she gets sick, but he feels like this argument is one he's going to lose so for now he just holds still as requested, and then suddenly he's back in his room, feeling extremely disoriented. There's another wave of dizziness, then sour heat in the back of his throat.

"--I'm gonna be sick." A slightly different kind of sick. He makes a desperate attempt to get to his feet and out of the room, but doesn't quite make it to the door before doubling over and puking. At least he hasn't eaten anything significant lately so it's not too gross.