In the seconds immediately after The Who concluded "Pinball Wizard", from Tommy, Hoffman, who had ingested LSD after working the past few hours at the medical tent, abruptly walked onto the stage and began addressing the crowd from Pete Townshend's microphone. He shouted, "I think this is a pile of sh**! ... While John Sinclair rots in prison ..." Alerted to the disturbance, Townshend (who apparently had been too distracted to notice Hoffman ambling onto the platform), snarled at Hoffman, "F*** off! F*** off my f***ing stage!" He then struck Hoffman with his guitar (which you can hear in the...