Peter

was not with them for the moment, and they felt rather
lonely up there by themselves. He could go so much faster than
they that he would suddenly shoot out of sight, to have some
adventure in which they had no share. He would come down
laughing over something fearfully funny he had been saying to a
star, but he had already forgotten what it was, or he would come
up with mermaid scales still sticking to him, and yet not be able
to say for certain what had been happening. It was really rather
irritating to children who had never seen a mermaid.