My interpretation of that quote is that he is referring to his impression after he stops. That's why he specifically references the stopping. You may be familia

My interpretation of that quote is that he is referring to his impression after he stops. That's why he specifically references the stopping. You may be familiar with the experience - twirl around for a little bit then stop, and you will feel like the world ("entire universe"?) is still spinning. Even though it's not. Of course, I may be ignorant of his actual intent.