Alright so I had a dream. I was on a Pyramidon and somehow there were like 15 people on this thing so everyone was fighting over guns. I walked up to the upper deck and I saw the guy on the Gatling next to the balloon get off and leave. Of course I jumped on it and then I saw a Mobula below us coming out of the clouds ahead. I open fire on it and get a few hit-markers but then all of a sudden... it does a BARREL ROLL! In my dream state I thought he must be a great captain and didn't even question that this wasn't possible. Then I saw him only flip halfway and he was upside down so I could only hit the balloon. I woke up and thought how cool that would be!
Imagine a pilot's item that released all of the air in one side of the balloon. Pardon my dream physics, but on the Mobula that side would fall rapidly while the other side rose, causing the ship to DO A BARREL ROLL! Then the remaining helium would flow evenly throughout the balloon to readjust afterwards. So the item would look like:
Pros: Did a BARREL ROLL!
Cons: -50% balloon health, anyone not piloting, gunning, or inside falls to a tragic death.
So if you ignore the impossible physics, this could be pretty awesome.