The sound of tapping fills the air, and the sound of a phantom's hoof echoes through the forest. It's not a phantom, it's a tree in the forest that's been knocked down by the wind. The thud of tapping confirms that the phantom is indeed there, and that the wind was caused by the tree's fall. The tree is covered with rocks, which means that its mouth is weak, and if the phantom wasn't there, it would attack the humans below. But the phantom waited until the humans were gone before sucking them into its mouth.