There were several reasons to answer that question. Answers that Lucian would never understand. Answers...like the precious shortness of a human life was. How, those humans who did realize that, lived every day like their last. Like Bella, who had absolutely no memory of her past, who didn't live in a time she was supposed to be in, and wanted nothing more than to go back to something familiar. Damon's heart ached at the very little he understood of her situation. Something else Lucian wouldn't understand. The need to help someone that was cared for.
He sighed and stood to physically distance himself from the other vampire, picking up his mug of tea and moved to the kitchen. Dumping the contents of the mug into the sink, Damon finally answered after a pause where the vampire took a hand to his face, scrubbing it. His voice was quiet, soft, "...I don't know." The younger vampire then flicked a thoughtful gaze at the older one, "How would you feel if Lena suddenly died?"