Istredd is absolutely too much in his own head right then to realize, but that's because he has already told Lucifer to stop murdering, so he assumes his general 'don't murder' would still apply. Although if it's in the Horizon, he can just roll his eyes and hit Lucifer on the nose with a rolled up newspaper like a bad dog.

Istredd scrunches up his nose at the very idea. Blasphemy! "That is ridiculous and very untrue." After a beat, he smiles though because it is funny as a concept and the waggling eyebrows are obnoxiously charming, as per usual. He knows for a fact it's silly but he can tell Lucifer's trying to get him to laugh, which is cute on its own.

He steps over to Lucifer and puts his hands on his hips, blue eyes getting some of that clearness to them again, less frazzled. "Once you win the ultimate game of hard to get, everyone else is really too easy." Now it's his turn to waggle his eyebrows at Lucifer, the obvious ultimate in question.