The US tour started on 20 November at the Cow Palace in San Francisco. The group were nervous about playing "Quadrophenia" after the British tour, especially Moon. Before the show, he was offered some tranquillisers from a fan. Just after the show started, the fan collapsed and was hospitalised. Moon's playing, meanwhile, became incredibly erratic, particularly during "Quadrophenia" where he did not seem to be able to keep time with the backing tapes. Towards the end of the show, during "Won't Get Fooled Again", he passed out over his drumkit. After a 20-minute wait, Moon reappeared onstage, but after a few bars of "Magic Bus", collapsed again, and was immediately taken to hospital. Scot Halpin, an audience member, convinced promoter Bill Graham to let him play drums, and the group closed the show with him. Moon had a day to recover, and by the next show at the Los Angeles Forum, was playing at his usual strength. The group began to get used to the backing tapes, and the remainder of gigs for the US tour were successful.