Since you can't gain possession by causing a fumble (which is the rule) the Roughriders still have possession. So First down on the 1 is the correct call.
That is an interesting rule. I thought it was going to be Hamilton ball, but the Riders get a single point. I believe in the NFL that would have been a touchback.
Ya but the ball went threw the endzone. The same thing happened to the Patriots a couple years ago in the playoffs. They returned an interception down to the 1 yard line, had the ball fumbled threw the endzone and it was a touchback.
With contrary logic, the team defending would be charged with a safety if they were stopped in the endzone. The touchback for a fumble through the endzone or recovery is a good rule.
either way, sask wins. if they had somehow deemed that hamilton had last touch possesion, then by knocking the ball through their own endzone, they give up a 2 pt safety and kick the ball back to sask.