Swamped

Eh, this is probably more than you would have seen if you had escaped early anyway. And you spooked him. Stay on their good side for the moment.

Though if someone is holding you by the arm like that in the future (standing next to you, facing the same way, holding the upper arm), you can break their grip by swinging that arm forward, up, around behind, down, and then forward and up again, aiming for the elbow area. This is a surprise and leverage escape, with emphasis on surprise. It may break their elbow in addition to their grip.