User blog comment:Kaido King of the Beasts/Chapter 784 Prediction: Gear Fourth/@comment-25365166-20150421122510

I think luffy might take in alot of air, and compress it emencly, like kuma does. when he stretches a limb it helps it shoot out, like an air cannon without loosing the air. this would also give luffy a nice glow effect like Kuma's Ursus shock. and the best part would be the release, like the general cannon or the one on the ship, it would be a high pressure air cannon