So every few dozen feet there's a large man with erect posture wearing an acid green windbreaker with ENFORCER spelled out across the back. Very conspicuous, which is how they like it. But it's all done with electropigment, so if there's trouble, these guys can turn themselves black by flipping a lapel switch. And they can make themselves bulletproof just by zipping the windbreakers up the front. Right now, it's a warm night, and most of them are leaving their uniforms open to the cool breezes. Some of them are just coasting, but most of them are attentive, keeping their eyes on the crowd, not the band.