[Qrow listens, and gently shoves under a mental rug the fact that he can relate entirely too well to Break's decision, or the fact that if he could be of use in an unique way like that, regardless of whether it was hurting him, he'd probably go for it. The mile-wide self-destructive streak will go unexamined another day.

As for the matter at hand, though -- he starts to think through the possibilities. His first thought is that the mushroom is something like a painkiller. Something that blocks a physical sensation without repairing the underlying issue. But the only way that would make sense is if his eye wasn't physically damaged at all and the blindness was a secondary result of something else.

But then Break explains the mushrooms were for clearing corruption, and suddenly Qrow remembers something from back in October.]

...I might have an idea, actually. Kind of a longshot, but...remember when I was sick during that festival and you had to help me home? It turns out I wasn't actually sick. Trench was doing something with my blood, so I'd feel like shit if I wasn't around Vileblood. If the mushrooms are supposed to...help with corruption, and that's tied to all the blood magic in the air, maybe it's your blood that's making it worse?