It was someone that had a negative experience in the psych ER, where he was only seen once. The psych ER security did not carry firearms, due to previously incidents of excessive force. Came in, shot security guard, shot through window of reception desk. Went outside, shot at patients, myself through window. Came back inside, killed himself.
But, to be clear this sort of thing does not happen a lot. However, I think it happens enough to where people should be prepared. I’ve been in similar situations before, and because of prior experience, drills, was able to remain relatively calm and take patients to safety, tell them to get down when being fired at, etc.