Swamped

Ringer is a highly competent hand to hand fighter. You just need to give him a distraction.

And that's what Bigfoot will understand, ability. In the same way that you know Ringer is able to get himself out of this mess. You know that Elmin doesn't have the ability to go back on a promise like the one she's made. She's essentially shackled herself.

Of course revealing that you know that means revealing that you know her, so just tell Bigfoot the truth: "I've fought her before."