This is true, one of my friends that was there agrees with you, and said pretty much the same thing on the night while I was still cold-raging. I didn't look at the glass properly to try to work out where or how it had been smashed but he might have had something on him. I had a weapon too but weapon fights are kind of something one should really aspire to avoid XD
It just takes the wrong shove and then it is gravity that can be the unfortunate event. Had a friend of friend get pushed back in a fight. He hit his head the wrong way and went into a comma.
Aahhh that's awful :O Was he okay in the end?
I am not too sure actually. That is all I really know of their story.