I am curious - in real life, did the Kriegsmarine award credit to whichever U-Boat "last touched" a ship? So, for instance, one commander could torpedo a ship and leave it burned-out & abandoned, but someone else who sank it days later with a couple deck gun hits would get 100% of the tonnage? That seems unfair. I know some air forces divided credit for kills or awarded them to whoever did the most damage.