Fear the king!
Do not disobey either of them!
Disaster comes from them suddenly.
Who knows the ruin that both can bring?”
You are to fear Yahweh. However, a new element has been added, the king. You are to fear the king just like Yahweh. You are not to disobey either of them. Disaster can come suddenly to you. Either one of them can bring ruin to you. Thus we see the divine right of kings, as the king takes the place of God here on earth. You should listen to both of them equally. You should fear both of them equally, since the king is practically divine.