He Kept a Close Eye on Her
Tom waited anxiously for the cops to arrive. He had no idea how long the woman would stay on the platform. In the meantime, he could only look and be vigilant to make sure she didn’t do anything dangerous. He kept a close eye on her, making sure she didn’t move from her spot. He also made sure that no one else came too close to her. He was determined to keep her safe until the police arrived.