It would be after each team had one possession. Assuming that the game wasn't decided at that point.
This way, after the Steelers scored last night to make it 13-10, the Titans would've had a possession that would've resulted in a loss, another tie, or a win. If it was 13-13 after their possession, the game would go to sudden death overtime. At least each team gets a shot.
I don't like the current setup, and I can't stand college OT.