This is a close-up of the deck legs and footings being pushed and bent forward as the soil moves towards the hill and begins to slide to the lake.
This is a perfect example of the immediate need for repair. If the area supporting the deck is moving, the soil behind the deck supporting the house is moving as well.
This movement can cause settlement, cracking of the foundation basement wall, the bowing of the foundation basement wall, and the immediate need for support.