Haki

Spirit Energy

In chapter 434, when Shanks went into Whitebeard's ship, he made the crews on Whitebeard's Ship to fall to the ground. When he clashes with Whitebeard spear to sword, the energy splitted the clouds apart. Later Luffy unintentionally uses it on Motobaro scaring it away in a fashion oddly similar to Shanks scaring of the Lord of the Coast.