"No. No, no, no," Lucifer says, holding up an unsteady finger and pacing back a step. There's a desperation about him. A fuse so close to being lit. "You're not here." It's Lucifer--and Gabe--that were always the tricksters. Not Michael. Michael wouldn't even understand how.

And it's all in the use of the word 'domain.'

Lucifer laughs. It wheezes a little on the edges. His stance is wrong and off-balance before he manages to teeter back into place, teeth flashing, eyes enraged, "And your domain is my Cage!" the disbelief is thunderous in his tone. "Of course. Of course. Like I'm really going to believe this again!"

(And like a broken record, his whispered thoughts: the diner. So out of place, it's literally out of mind. Lucifer may as well be ignoring that it exists in this space at all.)