"Let's have some fun before the adults show up."
"Grah!"
There truly was no use for Lucian's words—Kaiju Gerard probably doesn't even understand him anymore. But still, it didn't matter at all—Lucian doesn't care whether or not someone understands him, he will, and always without fail, try to tease or insult someone.
After all, during his eons of existence, the one thing he learned was that while the best thing to delete a problem is to literally kill it—there would usually be no satisfaction in that. Once you delete the problem, it's gone forever.
That is why he didn't just expose or kill Gerard there and then. He had been bored for millions and millions of years—and while a problem might be frustrating or even dangerous, at least it was something. It was something to spend his time on…
…that was his mistake in his past life.