He became aware of someone behind him, speaking in a low voice.

Too late he was aware of soft noises behind him.

Chapter 19 Blade became aware of someone standing behind him.

All the same, she was constantly aware of its presence just a few feet behind her.

Within a few moments she became aware of another one behind them.

He suddenly became aware of a white Mercedes behind them.

Then she became aware of the loud silence in the room behind them.

Bobby was just leaving the hospital when he became aware of the footsteps behind him.

Casey led the way out, aware of him behind her, but not looking back.

I was intensely aware of her passing behind my chair.