Put yourself in their shoes: Would you or would you not panic and try to resist if 5 armed men suddenly pinned you to the ground

Yes, and...?

Five masked and armed thugs? Yeah I would think so.

He brought his own permit gun to the demonstration. He was armed.
Law requires as a permit holder you cannot attend demonstrations with your gun...he had no business bringing it. Leave law enforcement alone.
Same reaction when cops pull over a speeding driver who has a gun in the car: they will go on defense.

No, not really.