Lucifer was feeling extremely amused at this sight, he could burst out laughing in satisfaction at any moment, but he miraculously held himself back from doing so.
If Lucifer laughed out loud now, it would be no different from admitting that he had killed Thomas or was involved in Thomas' disappearance. After all, he was not that stupid.
Lucifer clenched his teeth, trying to stop his body from shaking with humor, then he said in the softest voice possible:
"Oh right, speaking of which, yesterday everyone caught four humans who dared to invade the demons' territory. What if, just what if, those four humans did something to Thomas?"
Although Lucifer felt quite guilty for using his own kind like this, this was the best option he could think of at the moment. And perhaps it was the best option he could ever think of.
Blaming the four spies was a good choice because that way, Lucifer wouldn't be suspected.