Do not know if major or minor but if a scientist finds a gun on the ground or a security guard dies near him, he should be able to take it and shoot whatever is attacking, although in a fear panic with high inaccuracy and little training.
I also think that if there is an obstacle that isn’t too high that the human grunts jump over it and yeah.
PS. Not wished to be added, but I wonder if a Human Grunt can sneak up on Gordon and strangle him.