Rin continues to stare at that "bleeding," half wondering what it does to a person to have their blood turn into that. He already struggles to feel human as is. He can't imagine what it would be like to exist as a literal shadow of himself. How do shades even consider their existence living anymore?

He realizes he's been staring too long after a moment and gives his head a quick shake, as he grabs the vial. "Uh, is that going to be okay?"

Not that he knows how to tend it or bandage it since the smoke will likely seep through anything.