Raiden doesn't answer, too busy inspecting the padding of his jacket to even pay attention to what Snake's saying to him. He mumbles something about layers in frustration, but that complaint falls by the wayside quickly enough when Raiden finds what he's looking for and pulls his flask out of an inside pocket with a triumphant grin.

Should he drink more? Absolutely not. Unfortunately for everyone, Raiden is far too drunk to have the self-awareness that he's being an asshole and shouldn't be unscrewing the cap right now.