There was another tug and Merlin remembered what Nimue said about the tug before being transported to her. Was she calling him? Did she need him. The more he thought it the more he was sure, almost positive that's what it was. He tried to tell himself that it was just a silly thought, that he shouldn't go to Nimue's place in the middle of the night. She would be asleep. But he couldn't brush the feeling that Nimue needed him.
He found the crystal around his neck and focused on it, thinking of Nimue.