Jeff-- I didn't know that Saskatchewan defered in the first half either. But typically, here's how it's worked this year (off of two examples, one of which was in Edmonton, the other was in a game I think in Calgary... but I don't remember for certain).
Team A wins the toss and takes the ball. Team B takes the wind in the 2nd quarter. Team B then takes the ball in the 3rd quarter and Team A takes the wind in the 4th quarter... That being said Team A gets the wind in the 2nd and 3rd quarters, and Team B gets the wind in the 1st and 4th quarters.
TigerCats in very good shape to cover on this one, though I would have felt better if the Riders let those three points stay on the board instead of gambling on 3rd and short and possibly getting a TD here.