Be it the Galactic Dusk Sect or the Five Generation Sky Clan, Wang Baole had always taken the stance of neutrality. He wouldn't move against them if they didn't offend him. Since he had entered the Mystic Luna Realm, though, he had multiple adverse encounters with the two powers.
He had already exacted his vengeance on the Galactic Dusk Sect, with interest. He had wiped out all those who had hunted him. He was unable to kill the Core Formation realm old woman. However, she couldn't do anything to him while in the Mystic Luna Realm either. The feeling of having to watch him kill her own while helpless to stop him would only drive her into a spiraling madness.
There's another person I have to kill who's from the Galactic Dusk Sect, and that's Chen Hui! An icy glint flashed across Wang Baole's eyes. He had gotten the name of the old woman's disciple and made the connection between the two.