what type of arm lock is this ?

as the title, what type of arm lock is this and how can you defend against it? https://prnt.sc/34hHigeHn72t from https://www.youtube.com/watch?v=K0ZdUzn8IqY&t=37s

Submitted June 15, 2024 at 11:22PM by shailan_gsa https://ift.tt/dLhbnFe