So the other day Exmachina, Cyanide, Shneaky, and I were in a party when we came to the area where a ton of Gremlins attack you. At one point in the battle a couple of us ganged up on one and were beating him against the gate we entered through, and then suddenly he slipped through.
After killing the rest we shot at him with our guns for a bit, but eventually he just ran off, leaving us trapped inside the set of gates. We all ended up just having to leave.
Wasn't there another report on this bug happening?
Maybe enemies that wind up outside of the gate should lose their flag or however it's currently written up that marks them as part of the fight. As a failsafe in case whatever bugfix that prevents this doesn't work 100% of the time.