Martin Scorsese was a pretty young guy when he made this. I'm not sure what the interpretation of it is. Basically it's a young 20 something guy, routinely shaving with one of those big old Gillette double edged blades. But he keeps it up until he has cut himself so badly that blood drips from every place on his face. He is nonplussed and just keeps right on going as his blood runs down the sink drain. I guess he was learning his craft.