Hunting a downed pilot

An Alpha Legion marine with a dark mechanicus combat familiar hunts down a surviving Imperial pilot from a recon flight shot down over Stygian Territory.  During the Stygian Wars the forces of Chaos and the Alpha Legion in particular took care to hunt down any recon forces that tried to penetrate their territory going so far as to ensure there were no survivors.  The Alpha Legion holding to the ancient proverb that dead men tell no tales.