Ed was going to check the area for any unwatched medical equipment. He's good enough with sleight of hand that any stethoscopes or lab coats will be his without anyone noticing. He was a chemist, not a medical doctor, but he could fake it well enough if anyone asked him any questions. This would have to do for a disguise for now. If they needed someone to sneak into medical areas later, he could handle it. For now, he'll stick with the rest of the group, in order to keep from getting mistaken for the real thing.