Beer bottles thrown from close range splash off a 10-foot-high chain-link fence that cages off what looks like an agitated militia squad. A sea of seething, swirling bodies spits out shadowy figures that desperately try to crawl up and over the fence, only to tumble back into the carnage. Strobes and lasers cut through air thick with smoke, vaporizing sweat and billowing fog. Images of violent death dance on a screen to a soundtrack that suggests an artillery barrage.