I stand corrected, looks like he smashed his t/r and pulled a bunch of collective initially-bad reaction, there are no up collective emergencies.
As for the netting I agree that was the intent however hooking a skid toe or heel on landing or take off sets up a dynamic roll over situation and is more dangerous and likely than the natural sliding around on the deck, cant tell if they have nonskid on there or not but nonskid loses much of its helpfulness around month 3 or 4.
Never take off until someone shows you all the tie downs confirming that they are no longer on your aircraft.
I hold true to my original statement clown show.