If Midnighter feels any pain, it doesn't show on his face. This Archer guy touches the open wound, sandy and dirty and bleeding, and he doesn't so much as twitch.

"It'll fix up. Look, let's say my situation is... unique?" The tendons of his arms, reinforced fiber made to be denser and stronger than the average human, it shouldn't look too different than an average human being's shoulder. But it's stronger, coarser, is already showing signs of healing.