Have you ever seen someone being “stoned” by actual stones? :) and you call this violent.

Why is everyone using the word “slam” wrongly these days. They were hit with batons. Slamming in this context would be a full body slam to the ground.

Super stupid by the cops tho, they are really just trying to provoke a reaction here so they can escalate. If they deem the gathering illegal they can just arrest everyone and be done with it, but instead they resort to completely unprompted violence.