It was the ability to watch both of them men he cared for so much drift off into a deep sleep. He almost wondered for a moment if he had mixed something up with the magic he had put into those cookies, but either way they had worked just as they were meant to. The three of them had been through so much, seen so much, and the two brothers even more so.
Having this strong bond between the three of them, which was something else altogether really it seemed, it opened up Mark's eyes just a bit more. He could feel, and care, and maybe even love it seemed. These two were both the death of him and breathing new life into a heart he thought could never exist. It was this that allowed him to slowly drift off soon after the both of them.