It depends where on the bottle it hits and where in the face/head, ive been knocked unconscious by being hit on the top of the head with the very bottom of a champagne bottle that didnt smash, if your getting hit in the top of the head you want it to smash, if your getting hit in the face id happily take geting a raw bruise if it didnt than the f**kload of blood youd get if it smashed.