He was a fugitive and was running away from some royal guards who wanted to arrest him. He found a clearing and while hiding among the trees, he found a magnificent tower, tall and doorless. Nightmare walked around It, surprised, and looked for a way to climb over the wall. He looked in his shoulder bag and noticed that it had a rope and so he threw it as if it were a lasso and threw it on the only window of the tower. He began to climb over the wall and climb the tower(INSPIRED BY RAPUNZLE).