With as much injury seen among the stories, someone eventually had to take up the role of patching them back together. You know, in a physical sense. Mercy is only too happy to oblige in bandaging the others after some chaotic event. She is actually very collected in the way she treats the others, even with the house potentially coming down on top of her. It is believed that the horror of her story might have desensitized her. Or maybe the work keeps her from realizing what is going on around her. When she is not putting someone back together again, she seems to go off into her own little universe where nobody can possibly bother her. Her dedication to medicine is scary, and the kind of stuff she can pull on the human body tends to make her fellows wonder what’s going on inside her head.

Her story occurs very close to Dule's timeline, just a little afterward, and before Jerry's.