BJJ Fighter Applies Heel Hook on Concrete Mid-Street Fight

A street brawl erupts in Novi Sad, Serbia. Multiple people are fighting, chaos everywhere. One grappler sees an opening and takes a guy down to the pavement. He's going straight for a heel hook in the middle of the street, shoes on, people stomping around him.

The leg is trapped and the pressure starts building. His opponent is stuck, can't escape, and the grappler isn't letting go. Bystanders are yelling, trying to break it up. Others are still throwing punches nearby. This isn't a controlled environment. One wrong stomp to the head and it's over.

The grappler holds the position, torquing the ankle and knee. His target is wincing, feeling it now. People rush in trying to pull them apart. The submission is locked in tight on concrete with a street fight raging around them.

Does he break the leg before someone breaks up the fight? Can he hold this position with people trying to stomp him out?