"Hm." Levi doesn't further argue any other 'what ifs' - he well knows that often all you can do is make decisions as best you can with the limited, shitty information that you have. Some things are always a risk. He doesn't particularly consider drinking a potion that's unknown and easily ignored a risk worth taking, but clearly this man had felt otherwise.

Crossing his arms over his chest, Levi looks contemplative.

"What kind of healing?"

There is some appeal to that, even if he can't help thinking of the way the shifters can regenerate their damaged bodies. Creepy. But perhaps...it could have its uses.