"Oh you and I have stomached worse things, I'm sure." There has been no reason to stop, so far. Doc doesn't think he would find any reason to in the coming days. He is in a better mood when he's had a glass, aboe to think more clearly than when he is cranky and grumpy, and other people who have had a glass themselves would find him more tolerable too. It's a win-win situation, as far as he's concerned.

"Suppose we are turning in after this bottle. That's about as responsible as I am willing to be." Gives them a little bit more time to finish up, but not too much that they might risk filling in the silences that fall between them with questions or suggestions that might go too far.