According to the author of the video, Hannes Joubert, he saw lions as they were pursuing a cloven-hoofed animal.
On the published footage the wildebeest can be seen rising from the ground and trying to throw off the lions, goring one of them with its antlers. For a while, the predators hovered motionless over the animal, but soon the wildebeest began to whirl and eventually managed to free itself.