"Free."
Robin walked a few paces back, and then took a running jump straight off the Tower. He threw his grappling hook back behind him, felt the rope playing out slackly as he raced through the cool night air. He loved this feeling, just before the rope took hold and went tight. It was almost like he was flying; weightless and free. Nothing mattered except him and his lifeline, the rope. The adrenalin, mixed with a slight tinge of fear, was a heady brew that kept him sane and cleared his head.
But all good moments come to an end. He felt the sharp twang as the rope took hold, and his momentum was pulled up short. Gravity regained its control, and the world became a distinct view, the blurry colours separating into sharp, clear lines.