Rock disappeared into the night once more. He looked around the castle and realized Lady Long's window was the only one open, probably because it was winter night, and the castle was already somewhat cold even in summer.
'I lost my chance to meet with my Princess,' Rock lamented. 'I also lost the necklace I meant to give her.'
That white mammoth necklace was very difficult to obtain, as killing a white mammoth was strictly forbidden, and one unnecessary death would tip the scale of nature.
Hence, he had to search through the land to find a dead white mammoth. It was almost like a miracle when he found it, and now it wasn't in Princess Swan's hand.
Did he regret it?
No.
He just wished he could find two white mammoths before returning to the castle, so he could give one for Princess Swan and Lady Long each.