How do you come with this goofy idea that tying one’s self up wrist locking one member of a crowd is viable when you don’t know what the rest will do?
There were other officers at the scene. The “normal” mode is for one to deal with the drunk, one to keep the crowd away. If you watch the end of the video, one guy moves in and a security / LEO pushes him away.
I would have tried a wrist lock first, moving the girl to the nearby vertical post and then proceeded with hands behind the back and cuffs.