This is what happened.
Clone Kahless. Beam him into the cavern as he wakes up. Worf looks up, sees Kahless. Worf thinks, "This is like that time I saw him the the caves of whatever they were!" Betazoid mind readers hear Worf's thoughts. Betazoids then telepathically send this information the Kahless. Kahless repeats it, and Worf thinks he's magic.