Hopefully this is the correct stack exchange for this, if not feel free to tell me where to move it where it would be more appropriate. So I am a teaching assistant and masters student in the math dept. at a large state university. I was holding a discussion section this morning for the class I'm teaching and near the beginning some young man walks in with his shirt off acting verbally belligerent, he then comes up to the front of the room and just kind of stands there, not saying anything just kind of smiling in this creepy way and showing absolutely no signs of embarrassment or anything. After asking the class if anyone knew him (no one did), I told him he could either leave right now or I would get someone to remove him. I'm a small guy and he wasn't huge but he was certainly bigger than me. He didn't leave upon request so I stepped out of the room to go get someone, although in retrospect I had no idea at the time who I would have gotten, but then as soon as I stepped out I realized that that probably wasn't a good idea since he could take my stuff or who knows what. So I walked back in and sure enough he's got my water bottle in his hand, so I grab it from him and say something to the effect of, "!@#$ it, does anyone big want to help me get this guy out of class?" And two guys stand up, and one of them is clearly super pissed at this guy disrupting class and goes straight over to the guy and BAM hits him in the face super hard and he goes down and then hits him again and then kicks him in the face all in the span of like 5 or 6 seconds, like a proper #$!%ing beat down, and there are girls screaming and I'm a bit in shock as I was expecting him to just kind of strong arm him out of the class, and one girl comes up and is like "stop hitting him stop hitting him!" and I don't exactly remember what happens right after but the guy who was disrupting must have left, and then somehow the assistant dean is like right there and I step outside and talk to her and explain quickly what happened but I don't say that the student hit the guy I just say he got him out of class, and she says later I will need to file a report, and then basically I hold the class which goes fine. And then at the end of class I ask the student who hit the guy to wait for me so I can explain what the assistant dean said to me, and after dealing with other students who need something, I'm about to talk to him when the assistant dean comes back in. And basically I ask the assistant dean if she could step outside for a little bit while I talk to this student in private, since I'm not trying to incriminate him since I feel partially responsible since I asked for help and he did get the guy out. Well she gets super offended at this and tells me that "I shoo you, you don't shoo me, get this straight I'm your superior", and so I apologize but I think maybe the look on my face isn't sufficiently contrite and I look rather taken aback at her strong response. So she writes down my name. So no one not my professor/student-teacher liaison, not my ombudsman, seems to know what I should expect from all this. I talked to the police and they did apprehend someone fitting the guys description, so I probably don't need to worry about that guy coming back. I am however morally conflicted about having to write a report to the dean's office or whoever I have to write it to, since I don't want to get the student in trouble, since he helped me when I requested it, although I certainly didn't expect him to start beating the guy up, I thought he would just strong arm him out or something. I scheduled a meeting with the dean for a week from today (earliest availability), and now I'm super worried that I'm going to be fired or kicked out of my masters program. If I'm fired then whatever that's the way things go, but if I'm kicked out of the masters program that will completely screw up my life. Like I said no one (not my fellow TAs, not my professor/student-liaison, not my ombudsman) seems to know what to expect from all this, and if I should be worried about getting fired or kicked out of the program. Thus I'm turning to people here who maybe know what I should expect from all this.