shots after that. >> reporter: and you're a gun enthusiast, you fired an ar-15 before. you know the gun. you believe that's what he -- and an ar-15 is the m-16, the civilian version of the m-16 and it looks very much like a military weapon, yes? >> yes, that's exactly what it looks like. >> reporter: how can you be so sure it was that gun? >> i was close enough to see it from behind and he lowered it and he started walking slowly to the other end of campus. so, you could see it. i'm not 100%, but i'm pretty sure it was the ar-15. >> reporter: how many gunshots did you hear total? >> over three. i heard at least three. i don't, you know, remember exactly. i was trying to, you know, get people out and, you know, try to get people to calm down. and then i went to try to get one of my friends out of class. >> reporter: you've just spoken to one of your friends who is still locked down on campus. >> yes. >> reporter: what did they say? >> she is in the gym area and they have it completely locked down. they are trifeing to get people