For starters, while the video lasted for 40 minutes, Alex wasn't verbally berating Maia for the entire 40 minutes, so let's step back from the exaggeration.
Secondly, as many of us have said here or in Sekret Sources, this was a situation ripe with opportunity for Alex to lose control - primarily because of the lack of a coach or anyone besides their mother being present. Regardless of what our own parents would have done in handling a similar situation between their children, in a professional work environment, a manager would certainly have stepped in long before the 25-30 minute mark - and that's presuming Alex ever lost control like that.
Having said that, yes, I do agree with you that had a coworker behaved that way for that length of time, they most certainly would have been placed on leave immediately. I once (20+ years ago) had a team lead take it upon herself to pull a similar stunt - our team was working 10-12 hr days and our manager had already left for the day when this "lead" asked me to come into the manager's office where she proceeded to berate me for approximately 30 minutes. What she did not know was that everyone else on our team could hear her quite clearly through the very thin wall separating the manager's office from the conference room where we were all working. I had one co-worker come up to me afterwards and apologize for the conflict this "lead" had been stoking between us - that 30-minute berating where I maintained my cool & didn't give the "lead" any of the ammunition she wanted was a real eye-opener for our entire team and several of them took it upon themselves to file into our manager's office the next morning & tell him exactly what they'd witnessed. By the end of the day, the team lead had been confronted about her conduct and she wound up on leave for treatment of her bi-polar disorder, which she blamed for how she spoke to me. She wound up not returning at the end of her medical leave.