I have not read the story, but perhaps it means that Merlin has no control over the fate of King Uther's son.
Answer:
I was relaxing on the beach ?
Some of those dreams are freedom, peace, liberty, etc.
Skene is the word where scene come from. During the ancient Greek times, skene is a backdrop, which is behind the orchestra. Also, this serves as the area where actors change costumes. In an ancient Greek tragedy there were scenic elements which was used. These are mechane, ekkyklema, Pinakes, Thyromata Phallic.