Simon didn't know what had come over the woman, but he was being pulled away from the seat to..elsewhere. The fact that the sounds behind him didn't sound good at all...he had enough time to look around and spot the mole woman exiting before the healer instincts kicked in, as soon as he could crawl out of whatever place he'd hidden to keep safe.
There weren't many patrons at the moment, but Simon started checking them one by one. Someone had to make sure people were okay. The fact that he had been pulled away at just the right time was filed away for later, much later. As well as the fact that someone was more than seriously injured. He would have tried getting to the nurse, but there wasn't much left of her to check.
Instead he started with the waitress and moved on to some of the others who had been sitting near the point of entry, impact, devestation.