"But listen.

Can you see out into the street without moving very much ?" He turned his head.

He had been standing with his back to the window, and Zoe had been facing it.
"Yes, I can see into the street," he assented.
"Tell me--you see that taxi on the other side of the way ?" she asked.
He nodded.
"It wasn't there when I drove up," he remarked.
"I was at the window, looking out, when you came," she said.

"It followed you out from the Square into this street.

Directly you stopped, I saw the man put on the brake and pull up his cab.