Red Arrow came up and fired a gas arrow at the pyromaniac, hoping to knock him out.  He followed it up with a foam arrow aimed at the man's chest and started running towards him.  If he had known who his opponent would be he would be he would have brought more foam arrows.  Unfortunately he was now out of them.  He could use normal arrows, but...
Red Arrow stop the thought.  He was a hero, and heroes don't kill their opponents unless there's no choice.
Before he got to the man with the jetpack, however, he saw another man running at him.  Judging by his weapons and outfit he was a mercenary hired by Wayne.  Apparently Wayne hadn't hired the man to kill the protesters after all, or he wouldn't have sent his merc bodyguard after him.  Or this could all be some misguided attempt to make the people like him more, as he had someone protect them from the "terrorist".  Roy wouldn't put it past Wayne.
The mercenary drew a gun and fired at the man with the fire, and Red Arrow considered letting him just kill the man.  While he was sure he could get away with it, he wasn't sure if he could forgive himself.  Instead he dove at the pyro man to tackle him.  Once he was in handcuffs and disarmed he wouldn't be a threat to anyone anymore anyway.
He grinned at the pun as his dive hit the man.