The first thing Lex did was to erect an Imperial Shield above himself and Gisele. No matter how strong they were, being crushed by the enormous weight of a mountain of insects was going to kill them.
The next thing he did was analyze the situation. He had not expected the formation to change so suddenly. He was betting on getting inside the formation since he was sure that it would only block out the insects, not the humans. Or else, he would remain at the mercy of the immortal level insect. Though He had diverted one of its attacks, he could not do so again.
As it was, the immortal level insect no longer focused on him for a devastating attack from within the formation had targeted all the immortal level insects. What followed was a fight among immortals, held up in the air above the stronghold. Lex did not doubt that the empire would come out the winner in the competition, as the strength of the empire was not for show.