And they can use that energy in case the wind falls away, and the tide is coming up, and there is still a little bit of energy to reach the dunes and save their lives, because they are drowned very easily.
Podem usar essa energia, no caso de o vento abrandar, se a maré está a subir, e ainda há um pouco de energia para alcançar as dunas e salvarem a vida, porque se afogam muito facilmente.