The arm lock lasts about a short 20 seconds.
Now watch the video with sound switched off.
Without the emotive sound of blood curdling screams of agony
[genuine, or excessive pretence ????: debatable in absence of known facts of the situation]
does it really look as though the fat desk cop is seriously over reacting in malicious anger ?

You'll see countless disruptive uncooperative men & women being similarly restrained
for the safety of the public as much as for their own benefit
in every town high street thoughout the UK every weekend of the year.

Gotta try to remain objective, even if dislike of police authority is a standard default position.