My friend Casey O'Niel is Tom Cruises stunt double, which is the best, and worst stunt job in show business. He is at the pinnacle of the pay scale, but he never gets on film. He rehearses all of the stunts thatTom does until they are sure it is safe, and then Tom steps in and they roll camera. As for Seb, I'm sure Skynative is right, he'll do all of the Parkour, because like Jackie Chan in the old days, or Tony Jaa now, who are you going to get to double him?