On 28 October 2014, after a three-year stint with the Knights, Mason signed a one-year contract with the Manly Warringah Sea Eagles starting in 2015. On 13 May 2015, Mason was in the spotlight again, this time for being grabbed by Newcastle player Korbin Sims on the genitals in Manly's 30–10 loss to Newcastle at Brookvale Oval. Sims tried to laugh off the incident by saying "I apologise to the fans, the NRL and people involved with the game and the club, if anyone found it inappropriate", Sims told Fairfax Media. "It was merely meant to be a harmless gesture between two friends."
