["I punched Lucifer in the face" seems like a bad way to take this conversation, never mind his hand still fucking hurts, and knowing he's already worried Shiro enough just trying to talk to him in the first place... He kinda sighs as Shiro asks, feeling inadequate in his efforts, giving him an apologetic SORRY FOR BEING WEIRD kind of look.]
Nothing serious.
I know it's not exactly the ideal timing with everything that's going on, either. Just... [Wrinkles his nose. How is he so bad at this?]