This saga is very interesting and although I've been living in Southern Germany I've never heard about it...
I guess that the story's told from the Glassmännleins perspective!
And I wan't to quote the Pussycat Dolls' song in this context (and a lot of other songs probably):
"Be careful what you wish for cuz you just might get it" :D
RE: "The cold heart" - A fairytale as inspiration