I seen this mess last night as it came across my timeline.
I have no idea what started the melee.
You can see an older gentleman, who is wearing a red hoodie, run across the court in small choppy steps. His first step going into the stands is a "doozy." He slips & falls into the stands, gathers himself, then monkey crawls up another step, may or may not push a player in a white Jersey out of the stands, and then gets swallowed up.