“FUCKIN’ SLAYER!” was something we heard approximately 16,349 times throughout the ten-hour day at Mayhem Festival this past Friday. The band killed it (obviously!), opening with “God Hates Us All” followed by “War Ensemble” followed by…our fuckin’ faces were melted off. They also featured “Psychopathy Red” from their upcoming World Painted Blood, which we promise is a true return to form. We’re talkin’ Reign In Blood redux 2009 type shit. Hit the jump for photos from the set, and keep coming back throughout the week as we post more from the event.