Fuckkkk yeahhh dude!
Finally tracked down the footage.
This concert is from a couple weeks ago:
NotMTV - Not Mainstream Typical Videos
The band is called The Word Alive, and has Craig Mabbit (singer of Escape the Fate) as the lead vocals. Whoever I talked to about this right after it happened- I was not lying. Dogpiles on my HEAD. But, oh man, was that shit fun. They did a great cover of Lollipop. (This is only 1/3 of their set; they were the headliners)
Note: The reason why he's staring at/licking his elbow is because he got this huge gash in his arm that was dripping blood. D: