I have a question for everyone. We have touched briefly on whether or not the rest of the students in the class should have remained in the classroom during the "incident".
My opinion, as I stated earlier, is that the remainder of the students should have been removed from the classroom (asked to leave), and I think that should have happened at the point that the vice principal arrived-- even before the SRO was called.
I think the teacher should have dismissed them (or gone with them) with their belongings to the library, or another appropriate location, while making appropriate notifications . I base this decision on my experiences as a university teacher, and as a long term content specialist volunteer in my local public school district. The training I've attended emphasizes that when a threat or disruption is occurring outside the classroom, shelter in place quietly with the students. When a threat or disruption is occurring INSIDE the classroom by a student (or other), make every effort early in the situation to remove the other students from the situation. I have had to actually do this twice in my career so far-- both times at the elementary level. (Once was a parent screaming, threatening the staff, and melting down at the onsite daycare program, as she received the standard notification that her child would no longer be allowed to attend the program, due to disruptive and violent behavior.)
Anyway, removal of the other students serves several purposes-- safety for the remainder of the kids, preventing them from becoming part of the situation, preventing them from the trauma of witnessing the situation, as well potentially de-escalating the situation for the disruptor, who may desire the "audience" of other students as a motivation to continue to act out, or escalate the disruption. This also allows the responders to completely focus their attention on handling and negotiating with the "disruptor". (Not unlike well-established hostage negotiation procedures.)
Several posters here have said they thought the kids should stay in these situation. I'd be interested in hearing why, if anyone wants to discuss. Or what others think about removing the kids.