Amatul Rahmân Omer:
You might think them wary while they are dormant and asleep. We shall make them turn over (now) to the right and (then) to the left while their dog is (present with them) stretching its paws forward on the threshold in the courtyard. If you had become aware of their (true) state you would have turned back from them in fright and you would have surely been filled with great awe of them.