Before Cassandra could explain what she meant, Lex summoned another missile. This time, he did not sit on it. Instead, he summed an Imperial Shield behind him on which he could lean back, and placed his legs on the third missile.
Of course, by the time Lex placed his feet on it, Cassandra had already isolated it again.
It was more than clear that Lex was extremely dissatisfied with the way he had been manipulated. But instead of being frustrated, Cassandra found his little tantrum amusing. She, of course, knew that his true age was not that of his body. She estimated that he was, at best, a few decades older, though so to her he still really was a child.
The fact that he was showing his dissatisfaction, and complaining, even if his form of complaint was to threaten the temple with a missile containing a Heavenly immortal attack, meant that their relation was not pushed to the point of no return.