He does not, in fact, recognize the man without his helmet.

"Do you suppose it would make you more or less accurate?"

The liquor - presumably, that's what Isaac's lifting to inspect. His voice is pitched to be heard, but the grunt and clang of impact would serve excuse enough to shrug it aside. He peers into the neck of the bottle (untouched). May just walk off with the damn thing, if the stranger doesn't turn. There'll be ants at it soon.