Can a teacher grab someone without consent?

For context, I'm in middle school, and my 7th period is all the way across the school. So, I've gotta run a little bit to not be late. But as I'm running, an 8th grade teacher, who is also an assistant in my 8th period, grabs me by the bicep and says in an angry tone, "We're walking, right?" I didn't say anything or slap her across the face at the time because I would've ended up being late if I had taken too long. Mind you, my 7th period teacher gives lunch detentions to those that are late to her class by even a few minutes, so I simply nodded, shook my way out her arm, and started running again once she was out of sight. Now, although we aren't necessarily supposed to be running through the hallways, some of my other friends ran right past the teacher who grabbed me, and she didn't say or do anything. Am I in the wrong here?