"-- Thanks." His response to the girl is delayed, and he's hoping that asking for coffee is enough of a cover; if he seems to be half-asleep, he'll be able to get away with the dazed look that he seems to get whenever they talk like normal human beings. He's usually better at hiding these things. Off day following an off night.

What should he do now? Sitting down wasn't his first mistake, but he keeps digging himself a little deeper, making it a little harder to climb back out.

Which is why he says nothing else. He may have forgotten to give his name in return, or he's still dealing with the fact that they have another friend. Either way, they shouldn't be surprised if he's using his mug as an ashtray as soon as it's empty.