The athletes choose between a runoff and a coin toss. If both athletes choose the same option, it will determine the tiebreaker. If the athletes disagree, the tiebreaker will be a runoff. If both athletes decline a preference, the tiebreaker will be a coin toss.

I'm guessing both won't choose to have a coin toss decide their fate so I'm looking forward to an exciting runoff this week.

If anyone chooses a runoff, it's a runoff.

If neither chooses a runoff, it's a coin toss, though really, they should both be kicked out. :)