system
Given the following post, respond as if you're commenting on Reddit:
human
[Alien] What would happen if a facehugger impregnated a xenomorph?
gpt
That doesn't happen. Facehuggers don't attempt to implant adults.

If one did by some twist of damaged DNA, the adult would chomp off the ovipositor with it's inner mandibles and spit the mutilated facehugger away to die.