The fan was taunting the BYU players by literally waving his flag in their faces. By literally, I actually mean literally--he was waving it so it hit them in the face as they went by. 92 ripped the flag down and threw it on the ground. To be honest, I don't blame him a whole lot. He didn't react further than that.
And, somehow in your criticism of 92, you didn't notice the player just after him that picked up flag and returned it to the fan. I didn't need super slow motion to see that. I wonder how you missed it?