They were second graders for cryin out loud. That means they were sevenish Not the first time she lost it
Having had a wife who taught, I can tell you that second graders can get out of control. So generally, until proven otherwise, I side with the teacher.
I taught second grade for a few years. I had a student kick me in the stomach when I was pregnant. He then ran out of the building and down the street. I couldn’t leave the other students nor could I have run after him. He was like this on a daily basis. I can’t believe she lasted 25 years. I quit when that year was over and never went back.