Simply holding on to the trim wheel will stop any automatic movement whether it’s from MCAS or anything else.
Good to know, but was the trick and its life-saving potential made clear and taught in 737 MAX training? I doubt it. And why not make the aircraft safe from odd, deadly maneuvers that could not be controlled through intuitive reactions by pilots of ordinary skill? Supposedly, Boeing planned a software upgrade to do just that. Too bad they were not quick enough to avert two air crashes.