A thought provoking video, with a lucky escape, but where was the Emergency stop switch? It looks like the lathe had to be stopped using the ordinary Start/Stop controls.
And this raises that age old topic of why many swivel head woodturning lathes have their Start/Stop switches mounted on the motor, and thereby made inaccessible when you have a large piece mounted on the lathe. How do you get to the switch if things begin to go wrong, when the switch is hidden behind the workpiece?
All my lathes have EM stop switches mounted in an area below the tailstock, where I can hit them with my knee, if necessary, and most of them have been fitted with secondary remote controls, putting them in easy reach of any turning I am doing. Something I would recommend to all turners.