From their position at the top of the lawns overlooking the grounds, they had a clear view of the smooth black surface of the water - except that the surface was suddenly not smooth at all. Some disturbance was taking place deep in the center; great bubbles were forming on the surface, waves were now washing over the muddy banks -and then, out in the very middle of the lake, a whirlpool appeared, as if a giant plug had just been pulled out of the lake's floor...