Sure looks to me like Mr. Tambourine Man intentionally gets in the Officer’s space trying to edge him back.
Any contact with an Officer warrants a take-down. Any movement of others in the crowd that looks like an attempt to assist the one taken down also warrants a take-down. Any rush in the crowd toward the Officers warrants tear gas, pepper spray, rubber bullets, or other non-lethal action. Any brandishment of a weapon warrants lethal force.
This is how crowd control MUST happen. Anything less will embolden rioters and they’ll tear the Officers apart.
My only criticism would be that the Officers knew about the protest and should have arranged barriers between them and the crowd. Then it would be more obvious that the protesters were pushing into a space they shouldn’t.
Amen!