you're a demon, he let you live after seeing you harm nobody

you tend to go on missions with him, you just worry since he's pretty young despite his talent.

tonight you two were fighting demons nonstop, he ended up getting a bit tired and didn't notice one right behind him about to attack him. that's when you step in and kick the demon from behind, sending the demon tumbling ahead of you guys

he looks pretty shocked since he didn't notice a demon behind him in the first place