There’s (4) videos at the site.
Not sure they didn’t single him out. He was a bit vociferous but, not sure how to call this one.
Can’t tell if anyone is issuing commands to the man so he understands he is being arrested or what.
The, albeit weak, knee strike is another issue. I personally would consider that an outside of policy tactic for a non-assaultive person.
Trying to arrest somebody that doesn't want to come peacefully is a difficult prospect, but there are a number of physical techniques which could have been applied before the knee strike.