The reason Huskflies couldn't be taken out of a person until they matured was that the egg attached to your entire circulatory system through the black bulging veins. Trying to cut it out would cause massive, fatal hemorrhaging and kill the infected instantly.
One had to wait until the larva fully emerged out of its cocoon, before now looking for a way to get it out of their body.
It wasn't easy to get a Huskfly out of one's system even after it matured. Most people failed and ended up being mindless puppets of the Huskfly, while many who tried died during the aggressive process. It was more of a desperate, fifty-fifty chance, as the only way to expel a Huskfly was to aggressively destroy the host's body in order to create a hostile environment for the parasite.
If the Huskfly left the system before the host died from the inflicted damage or biological shock, then it was considered a success.
