I guess it's been too long and nobody remembers the logic. Hindsight, they should've done a Roland Cheng on this guy. Let him soil the seat. Declare him unfit and divert and drop him off at YVR. Leave 100 seats empty around the stinky seat, reboard the Mainlanders or whoever unable to enter Canada, transfer excess passengers to BR/AC/CX/CI, etc. It costs money but a lot less than this PR disaster (and the 777 already unusable for a few hours after arriving at TPE).