Personally I find it a bit strange, considering he did get alot of exposure at the Red Bull training grounds back in July where he placed 2nd, loosing 2-4 to Golden in the finals.
Best of luck in the future to Sound!
I asked Golden if he could say anything about why Sound retired, School? Work? Lost motivation? Military? Kicked from the team? He replied "I don't know because I were home when he retired"