In speed basics 2, I scored some hits on the DD's rear 5 inch guns. I assumed this would prevent them from firing back at me, but while their forward turret was unable to rotate backwards, they had two magical 4 inch guns which appeared to be able to fire through the superstructure and funnels.
I also noticed that when I had done enough damage to them to allow me to catch up, my guns seemed to stop firing even though I was at point blank range. It wasn't until the enemy fixed the flooding and tried to run away again that my gunners decided to go back to shooting.
Both seem like bugs to me.