While Mal and Kaylee might have wanted the freedom of a floating tin can, Simon was getting used to walking on the ground again. He was getting used to having an apartment, having food, and not running when jobs went bad. He liked the stability of the ER even if it got a little chaotic. He knew where he stood here. Well, usually.
He hadn't planned on seeing them, especially not her...here. River had said she'd gone back to Serenity, and now, well, she was back. He smiled a little, but then looked at the captain. His attention went quickly back to Kaylee who was bleeding.
"You know, I'd really like to meet one of you not bleeding or crazy or threatening me." Who know which was which.
He pulled on the gloves, pulled the proper medical paraphenalia for the job, and moved to start examining the mechanic. He didn't smile; he wasn't even sure how he felt about her being here. He even went so far as to give Mal a glare, as if the captain's selfishness to have a full crew might have brought an innocent Kaylee here. He doubted that the captain's need for control would have done that, but with the City providing...when it wanted. His death...
Simon's wandering mind probably wasn't the best thing for his bedside manner, nor for his handy work. He might have prodded a little too hard or poked where he shouldn't. Of course, he'd apologize every time Kaylee might have made an unhappy sound, but he wasn't completely invested in his doctoring.
"How'd this happen?" Another hint of a glare at Mal.