These two verses reinforce the concept that it was God who moved and protected them. The people of Jared recognize God’s hand, and therefore sing his praises. Not only were they driven by the wind (indicating God’s spirit moving them), but they were not affected by any monster of the sea. Jehovah was the God who, in the old stories, had defeated the water monster Rahab.
They were physically protected, and they understood that they owed it to their God.