It came into Graham's mind that these also should have swarmed with people.
He felt a curious emotion--throbbing--very fast! He stopped again.

The guards before him marched on; those about him stopped as he did.

He saw anxiety and fear in their faces.

The throbbing had something to do with the lights.

He too looked up.
At first it seemed to him a thing that affected the lights simply, an isolated phenomenon, having no bearing on the things below.