Those are anti-piracy markers. I think there is a thread floating around about it. Ahh, here it is. For my eyes, I was able to catch the action, but I'm fairly accustomed to quickly edited movies. Most of the audience was a well, as there was an excellent gasp as we saw the cannon stopped by...
Quite impressed myself. I had some unfortunate seating and a distracting neighbor, so I think I'll catch this again. But the detail was just overwhelming, and they gave some nice attention to living conditions and traditions aboard the ship.