Revenge. I won't let you hurt my friends, if you're still going after Atem.

[Ryou had heard about the Thief King and his past. He knows what revenge likely means in this case, as long as Atem is around to go after. In any case, Ryou won't let the spirit hurt his friends anymore, not here.

Then the topic turns to the Ring and Ryou blinks confused, not sure what to do with being complimented by the spirit of all people.]

...I was lucky. I could have been rejected like everyone else who tried to claim it.

[He is not thinking about why he, specifically, was claimed as the bearer.]