You forgot about the infamous Pantera concert in Dallas, were the fans tore up the floor board of Reunion Arena(I think) and start throwing the debris around and eventually starting bond fires. :P
Were Pantera concerts just naturally violent? The only time I went to see them (Cowboys from Hell tour), in the middle of the concert (stadium seating) people started going nuts, throwing chairs, climbing over us, trampling people, shoving security guards to get to the front. It was insane.
I was never much of a Pantera fan (I took my brother), because of the pot references, and they tended to attract the more stupid fans, but Dimebag was an INCREDIBLE guitarist, one of the best.