They should behave there as they behave under normal conditions.
Alas! the facts force me to reject the statement that the males have time to escape; for I once surprised a male, apparently in the performance of his vital functions, holding the female tightly embraced--but he had no head, no neck, scarcely any thorax! The female, her head turned over her shoulder, was peacefully browsing on the remains of her lover! And the masculine remnant, firmly anchored, continued its duty! Love, it is said, is stronger than death! Taken literally, never has an aphorism received a more striking confirmation.

Here was a creature decapitated, amputated as far as the middle of the thorax; a corpse which still struggled to give life.

It would not relax its hold until the abdomen itself, the seat of the organs of procreation, was attacked.
The custom of eating the lover after the consummation of the nuptials, of making a meal of the exhausted pigmy, who is henceforth good for nothing, is not so difficult to understand, since insects can hardly be accused of sentimentality; but to devour him during the act surpasses anything that the most morbid mind could imagine.

I have seen the thing with my own eyes, and I have not yet recovered from my surprise.
Could this unfortunate creature have fled and saved himself, being thus attacked in the performance of his functions?
No.

We must conclude that the loves of the Mantis are fully as tragic, perhaps even more so, than those of the spider.