In port battle some ship can escape while they are completely surrounded by enemy ships, demasted, lost all armor on one side, most armor on the other side and are in the process of sinking so when people see that kind of ship they will usually switch to another target that is still active threat because that would be like beating a dead horse hitting that ship without armor just to keep it in game. But magically if we leave that ship alone 2 min just before it sinks completely it will have time to magically disappear and escape from battle.