Those of us who've been watching this situation for a long time said this would happen. TRAs are escalating from threatening violence to acting on it, just like we predicted would happen when the wheels started coming off the bus.
I hope the young woman who was attacked was OK, and that she presses charges. Probably won't result in anything but would be good to have a record if the same people try the same shit again. And BTW, this? This is why some of won't play the pronoun game or the "well they're kind of women in some metaphysical sense" game, because once you do that it's a short skip and a jump to "well we're just two women fighting, what's the problem with that?"