That article scared the shite right out of me. A four foot drop? For every action, there is a equal but opposite action.
I watch a story about tsunamis. One woman told a story that her grandmother told her. She said when the water goes way out, you will hear the boulders under the ocean start to rumble. If you hear that, run. Because when the boulders stop rolling out....the water is going to come back. And if you wait, you will never out run it.
I think the boulders might be rumbling (metaphorically speaking.)
Amazing! Scares the Shiite out of me too!