When Janek noticed Fifield's monitor was outside the Prometheus' hangar door, a mechanic ordered Barnes to open the door. Barnes opened the door and the other mechanic went outside to inspect Fifield (who was infected by the black liquid found inside the Engineer Temple). The mechanic kicked Fifield, but nothing happened. The mechanic told Wallace to take a look at Fifield, but the mechanic was killed when Fifield smashed his helmet. Barnes was killed in the ensuing chaos.