I've seen that in races before. Cat-5 morons are so amped up on caffeine, 5-hour energy, and race-day adrenaline that they become violent neanderthals.
Bicycling is not what it used to be. I quit racing two decades ago because of the devolution of cycling. Today's hyper-competitive yuppies have ruined the sport.
Back in the 80's, I could race and everyone would talk to each other and we were all friends out on the road having a good time being competitive with character and integrity. I did a lot of racing out in Colorado, and you could be competitive, but also count on the other riders looking out for you. If you saw another rider in distress, you'd at least put a hand out and ask if they were okay. Riders competed, but they also cared about eachothers' wellbeing.
Something happened in the 90s. I'm not sure what it was, but people started getting nasty. Racing was no longer a sport - it was personal. The younger guys HATED you. You were not their friend. They were there to BEAT YOU, and not to have a good time. It was War, but one in which they simply did not understand that a 30 year old rider with 10 or 15 years of racing experience was going to shellac a 20 year old hot head in a race every single time, as had been done to them a decade before. That generation was not taught, or did not learn, that the 30 year old rider was a mentor, teacher, and friend - not a sworn enemy to be defeated.
That was when I said "fuck it" and stopped racing. About 10 years after that, in the 2000's when Mr. Dope-head started winning Tours de France, it got even worse and the "every ride is a race" mentality filtered down to the group rides, charity rides, and basically any time two riders met on the road under any given circumstances. I rode with three or four guys in my age group on a regular basis, and we always did our best to avoid other riders as much as possible.
Maybe it's just because I'm getting older, or maybe it's because the younger generations are not being taught how to be human beings with empathy and compassion for other living things. Indeed it seems like today's young people are a bunch of violent, maladjusted, narcissistic sociopaths to me, whether on a bike or not.