Well, whenever I play against Sean, I don't really fight him.
I sit there and parry everything.
A surprise choke attack here or tornado kick there can do some damage.
Yet, the reason I lost (besides the extreme rust factor) is that I absolutely suck using a joystick on the Player 1 side and regardless of what slot I plug the joystick into, I always start on the Player 1 side.
In arcades I always played on the 2P side, in old console versions the controller plugged into port 2 would always start on 2P side.
So as I'm a hit away from finishing Sean, I try to dragon punch and it doesn't come out, and I was felled.