Yep. And intentionally cutting him off while he has his lights on and was performing a stop, doing wheelies a couple of feet away while he is out of his car show intent to do harm. And yes, the bikers in the back of that group are as guilty as the ones up front. The are all part of the same overall crime, they are all responsible for what happens.
Would I be in fear for my safety in that situation. Damn right I would, and so would all of you.