"What happened here? Is anyone bleeding? Anyone else got hurt?" one of the security guards said, seemingly puzzled.

Startled by the guard's question, Lisa followed the guard's gaze and saw the bloodstain on the escalator steps. The blood stains were barely noticeable on the dark gray escalator, so Lisa had missed it earlier.

That bloodstain! It must be Terry! Terry had fallen on this spot earlier. He was bleeding!

Lisa felt something pressing on her chest, making her breathless. Terry was hurt, but he had left without saying anything! She blamed herself for being careless. Terry wore dark-colored clothes, making it hard to see, but she should have been more attentive and noticed it earlier.

Lisa was soon home and had trouble sleeping. Her mind would not stop replaying the scene where Terry had fallen on the escalator with her. Whenever she closed her eyes, she thought of Terry, and doubts began to creep into her mind. Terry had gotten injured, but he had left without a word. Wh