Inez had noticed that most people take at least three steps before they stop, if any one calls them suddenly when they are walking fast.

It seems to need as much to balance the body when its speed is checked.

She noticed everything that could be heard.
She grew nervous.

It seemed to her that her companion was walking more slowly, as if not wishing to leave her any distance behind.

She quickened her own pace again, fearing that she had excited suspicion.
Then she heard the Princess stop suddenly, and she had no choice but to do the same.