If theres a lesson to be learned from the man and woman getting punched from behind, if you're gonna get involved/place yourself in a fight thats already taking place, never have your back turned to anyone who was in the fight.
Not even the person you're defending.
Edit - someone just said it before me
I think the ground was holding him and they were taking turns kicking him in the face.After he hit that lady somebody should have just held him and every body take turns punching him in the face.
Don't go jumping into warzones if you ain't ready to receive strays.