Alpha Wolf involved in altercation with security at show at The Warfield in San Francisco

Australian metalcore outfit Alpha Wolf had to cut the final song of their set short last night at The Warfield in San Francisco after vocalist Lochie Keogh came to the aid of a crowdsurfer when security failed to catch him, causing him to fall over the barricade. 

The crowdsurfer shared the following along with footage of the incident. 

Crowdsurfed during @alphawolfcvlt 'Akudama' and security didn't even try to catch me. i hit my head on the barricade and sprained my ankle, Lochie got upset at security and the guard decided to pull him down from the stage along with some stage lights, resulting in the end of their set and this altercation. 

Additional footage was shared by a fan on YouTube.