At the end of Pictures you can hear the crowd shouting “Doctor”. Mike Ferguson, who was in the crowd shared his memory of the event with the BBC. “King Crimson playing 'Cirkus', a rousing rendition, but someone was ill in the crowd and people were calling out for help, and it was all sounding quite desperate - all of this building to a crescendo as the music itself built to a climax. Eventually, someone shone the tower lights in the direction of the shouting just as the music reached a peak.”
Claire Whitaker was also at the festival and shared this observation “My lasting memory is trying to sleep under the stars in the main arena and listening to King Crimson playing the Devil's Triangle in the middle of the night!”. Judging from the mayhem of the Devil’s Triangle captured for posterity here, it seems like that Claire wouldn’t have been the only one whose sleep was interrupted that night.