Beller knew to stay away when cousin Belladonna was in her "moods."
Dameon, on the other paw, thought about this offer. He knew the big guy downstairs would likely do away with him if he kept doing "goody goody" deeds.
However, despite the natural urge for destruction all the hellhounds shared, many of them didn't go to the surface unless assigned. He figured he could stick with the darkness and be with Anne, and not get assigned any tasks. Since he once resided in Heaven, he still had a trace of goodness in him even after his transformation. When he finally decided to change, to avoid living in a "hell-on-heaven" you could say, he was mainly used to supply the Master some info on Heaven.
"Fine Belladonna, I'll be on your side," Dameon finally said. He knew that well still receiving a lot of resentment back in heaven, some of the other angels understood why he did what he did. Some even gave goodbye gifts when he went to stay with Anne.