Gabriel asked if he could take a break from the album; the group refused to let him. "Friedkin freaked when he heard he could be responsible for breaking up the band," Hackett says. "Pete came back to it."
With both Charisma boss Tony Stratton-Smith and Tony Smith working out a middle ground for the group, Gabriel ultimately did not work on Friedkin's project, which became Sorcerer.
Source: 'I was aware there was something going on with Peter', prog.teamrock.com, 22 May 2015