I worked for 34 years in Steam Electric Generating Stations. The steam turbines had a main governor, and a pre-emergency governor and finally an emergency governor that tripped at 10% overspeed. We had to once a year due an over speed trip test to test the emergency governor. The pre-emergency governor was tested once a week. You never want any large turbine, either hydro turbine, gas turbine or steam turbine to overspeed to catastrophic failure.
I mean, here's the ONE case where vertical video is actually appropriate, and STILL humanity hasn't figured out that the recording will not flip when you rotate the phone. At least it went back so we could view the important stuff in time. :D
2:34 is when the load is rejected. Its chilling to see how quickly it starts to spin after this moment and how fast the governor has to shut the wicket gates. Not hard to see how a generator could fly apart from accidental overspeed
