That guy will lose his eye and it's worse than losing a limb. That eye was the reason why he's powerful after all.
Iirc, Cheonma plans on killing him but the poison elder stopped him from doing so. And after this incident, Cheonma and Wi Soyeon will have an intense s3x scene to cure her disease but i believe we'll be seeing that next season since this season will end 2 chapters away and if the publisher and artist decides to draw it. I'm hoping they draw it even if they had to censore it. That's one of the most important plot regarding Cheonma's character development as a person who understands emotion and affection for the first time.
Maybe it's a stretch for me to associate it with the plot. As for why they had s3x, it's necessary to cure Wi Soyeon's disease or else she'd die. It's just that after they did the deed it felt like he's becoming more human and slowly but surely can identify what kind of emotion he's feeling unlike before that he'll just brush it off if he doesn't understand that emotion. And if I'm not mistaken, that's the trigger for Cheonma to see blue spirit as a woman. He's still ruthless and cruel tho