You are Guard 1 and you were on patrol aboard the space shuttle/ship you are on along side Guard 2 when suddenly Guards 3 and 4's communications go down and you go to investigate only to find their weapons and helmets on the ground covered in saliva. You 2 decide to split up and look for the threat but only a few seconds after splitting up you hear your partner scream and then quickly become muffled, you go to check it out only to see a Gnarpian swallowing your fellow Guard. It digest your fellow Guard very quickly before it then notices you and goes invisible whilst smirking mischievously. Out of desperation for survival and the fact you can't see it currently you run to a nearby storage room/freezer and lock the door with a fingerprint/staff recognition code and you are the only one in there because the alien is not faster than you, so, your safe in there for now. You have a weapon just in case of situations like this, just with out creatures like this, also your human guard in a red and black armored suit with a red and black helmet that covers your entire head and face and you wield a full auto rifle like gun