Actually, I think something like that is more likely to happen when a bunch of antifa goons eventually gets bored and decides to go on the prowl when there are NO competing "official" demonstrations, and suddenly experiences a catastrophic failure in their victim selection process.
I don't know why, but antifa has really gotten under my skin. My blood pressure rises just at the word. After watching them get free passes or slaps on the hand after physical assaults to involve bike locks, hammers, and all manner of instruments that most prosecutors would list as "deadly" in similar circumstances, non-antifa, I just become infuriated.
If it were antifa on proud boys violence, or vice-versa, I might look at it the same as gang on gang violence - they're just hurting each other, so whatever. However antifa does this stuff to people who are in the wrong place at the wrong time (like the old guy trapped in his car when they blocked roads) or to people, who maybe weren't doing the brightest thing, just in the area to see what the commotion was about. Or to journalists. And hey, journalists! Why are you defending antifa? I thought journalists were "under siege"? Or just if you're the right kind of journalist?
Anyway, I shouldn't let them rile me up so, but yeah, every time I see one of their gang up and beat down videos, I kinda hope they picked the wrong person, and their "victim" goes nuclear on them. I think a few instances of their "victim" leaving them in the same state that they leave their victims, and most of them will slink back to their parent's basements.