Lucifer was waiting. Most of the time he watched the stars and the sun sets and rises, and just waited. He wasn't pushing the Apocalypse as much as he was guiding the Saints on the paths that would break the seals.
And then. Well then he'd go home.
So he ignored the Saints and former Saints until they needed a lesson of who they belonged to, and just kept to himself. He who had haunted the steps of so many Saints, was now eerily quiet.
When he heard the buzzer he motioned to the demons to let her in before turning back to the window to look out over the city.