It's just your nimble skill, so look for ways to boost that!

Heavy : i am  not afraid of any man, but that thing (insert goreal's avatar here), It scares me.

Heavy : i am  not afraid of any man, but that thing (insert goreal's avatar here), It scares me.

Have you tried progressing the story line with the Science lab or Linda? If not, find hidden military base (+6 senses skill) and return to lab to remove them, (repeat at least 2 times) sleep for a  few days and you'll find the lab infested with the meat parasite.