Glenn bowed up like a gorilla and then took that shot like a man.
Boxing is difficult when you are short and have stubby arms. Taller dudes are gonna be able to touch you up a lot easier. It's good to be aware of that in advance of any fistfights.
I've seen the video many times it looked to me like a sloppy punch kinda hurled at Danzig. Danzig was unlucky on that day.