Miles shrugs when Cassie tells him not to "hog all the bad ones." Guess he'll have to be less obvious about it.

Then he's so floored by Cassie's truth that he completely misses the water glowing again. He knew it! She is a Giant Woman, just like the version of her in his universe! He wants to ask her all sorts of questions now, but that's not what they're here for. They're here to help Frank.

So what's next? One possession and one debt. That one's not as obvious as one truth and one lie, so Miles has to stop and think about how he's going to respond.

"I possess..." He's not sure what he's going to say, when he has an idea. A risky idea, but then... he can trust Frank, right? He knows he can trust Cassie. She already trusted them both so much. And the whole reason behind keeping your identity a secret is to protect your friends and family, but none of Miles' friends and family were here, so they're safe, right? And besides, Frank isn't going to tell.

He takes a deep breath, and decides to go for it.

"I possess a mask of my own. Just like you."