What does this dream mean!?

my boyfriend, me and students are in my science class and my teacher was there too. One student got in an argument with her and i guess he threw a cylindrical jar at the teacher and she got cut (looked like a Pringles can, only glass). The teacher throws a jar that looks like the same one back at him and starts yelling something like "you can't just throw things at me!!" I guess i got scared in my dream and my boyfriend stood up and i followed him to the back of the classroom where we could watch at a safer distance. The teacher, i remember, had a huge cut on her forehead. it wasnt bleeding in my dream though. i remember watching this kid use the jar to cut it across her head. She made a terrible face as he did. although, the kid that was doing this had many more cuts on his face that were bleeding. He looked hurt and calm with no anger or hostility in his face or movements. My dream skips to where the teacher and the kid is no longer in the classroom. Me and my boyfriend are looking at the teachers computer. all of a sudden on the screen and on the intercom came the message "Radio Code Red" (im actually very determined to find out what that phrase means.)I turn to my boyfriend and ask what Radio Code Red means. He says he doesnt know. So we head out of the classroom quickly and my dream skips to where me and my boyfriend are in a small room thats a bedroom. we are somehow still in the school. I just say maybe theres an apartment in the school. the door to this room is an old white wood door with a white knob. the door doesnt shut correctly and the lock on it doesnt work. I mention this to my boyfriend. He says oh well. we quietly sit on the bed and we start to hear something outside the door. In my dream and for real i feel tense and scared at this point. me and my boyfriend quietly and slowly start to climb off the bed to hide in the closet in this room which also has a white wood door. unfortunately, i woke up at this point with much fear. i have these weird dream often. Please respond! I would love to hear some comments and answers!!