There was the concern that the tiebreaker was considered part of the test whose tie it’s breaking, and thus any rules which state “only 1 of X per test” applied to it as well. There was also the concern that if you were to use a trait on a tiebreaker roll, you should have used it to break the tie in your opponent’s favor. Just checking.
Hm. So you think it could go either way, or would you recommend just keeping it one-on-one?
Amusingly, after giving it some thought, I think I wouldn’t want a player Invoking the Negative Aspect of a trait on a tiebreaker roll, after all. Why would you want to break the tie in your opponent’s favor for 2 checks and guarantee a loss, when you could use the “hurt” option to give your opponent +2D on the tiebreaker roll, get the same 2 checks, and then have a chance of winning the tiebreaker, to boot?