room. ashley davis saw the wounded daughter at he went by. he was talking, everything like that, and, i mean, he looked he appeared to be fine to me when i seen him. i only seen him probably about 30 seconds. reporter: employees were told by e-mail and text messages to shelter in place. my boss told me what happened. there was a guy running around with a gun and to stay put and that was it. what did you do at that point? i stayed put and then i came out here with my co-workers. reporter: after assessing the situation, police reopened the campus, but kept several floors of the nelson building locked down. at about 1:30 p.m., our s.w.a.t team was able to determine that inside the room we were able to see that mr. davis was down on the floor suffering from an apparent gunshot wound and that his mother was also unresponsive in her bed. reporter: johns hopkins officials says the police response left them breathless. the warnings performed flawlessly. preliminaril