How does turning your PWC over the wrong way damage it when you capsize?

On quite a few older 2 stroke jet ski's, water is injected into the exhuast flow to cool the exhaust pipe, and possible turn the pipe. If the moter stops running and you turn the ski over the wrong way this water can enter the cylinders. Once in the cylinders it can damage the pistons and rings. If the ski is running this is not a problem because the exhaust gasses keep the water from entering the cylinders. If the ski is not running there isn't anything to keep the water from entering the cylinders if the ski is rolled the wrong way.