MC: "I'm too full to eat your soul. You've got really good luck"
Guy: ".... Luck?" (more literal translation is, 'luck, you say?'
MTL: MC: "~~~ Consider yourself lucky"
Guy "......... yes"
The tone changed from a demon nonchalantly explain that the only reason this guy is alive is because she's full, and him being incredulous at her reason, to about a demon showing mercy and a guy meekly accepting it.
(which then contrast with his later attitude of defiance)