He looked at it and took an involuntary step back.

He took an involuntary step back as Charles regarded him.

I started for him and he took an involuntary step back, then recovered.

She took an involuntary step backward, and that brought Need into view.

It was enough to make him back up an involuntary step.

He watched her as she took an involuntary step backward.

Taking an involuntary back step before he could turn, Harry saw the window again.

She took an involuntary step back from the sudden heat.

She took an involuntary step forward and he shook his head.

As their eyes met, he took an involuntary step backward.