After the "smart move" that allowed the poor guy to smash "voluntarily" his face on the armrest, moments later, he came back in the cabin, as shown in a video.
https://youtu.be/eU1HPwKrMrY?t=28
There was lost the last chance, the airline or a decent crew member could step up: "Ok sir, sorry for all inconvenience, we'll fly you home. Now the price of a seat is 2000$!