Robert has a weak stomach, and some of those... failed rounds with Booker and Elizabeth left him feeling more than just mild nausea, so it's with a nervous laugh that he brushes off how dark that was. He shouldn't be that surprised since the lines between Booker and Comstock tend to blur sometimes, and the things that either of them have done up to this point (picking a singular point was still so strange) make one death seem minimal.

Maybe at a different time, Robert would have made a comment about how Booker never did seem to think about consequences too much and that it seemed they were all brought here with intent of some purpose, so even Comstock's arrival would have a relevance of some kind to the tasks this place had at hand. However, right now wasn't the time for that, so he would refrain.

"Personally, I'm not sorry either. I have him to thank for what happened to Rosalind and I, though in the end, I suppose we could have simply ceased and that would have been a worse end. You would never have been there for Elizabeth when she needed someone, as Rosalind or I wouldn't have been there to guide you across." He starts carrying on into things that perhaps he shouldn't carry on about. He doesn't exactly have a sense of when Booker is from.

"Though I imagine long enough, she would have just taken care of herself. She's a strong girl."