Real reason

Kleb, still sitting at the piano, which must have been in some way Jork's worst and best torture weapon, settled down to play.

They exchanged one last look and then Kleb finally played. He played music, a song that only Zion would listen, but that the whole world would hear.

The light at the beginning was dim, though fabulously beautiful, and the song so serene but quiet that it was almost silent, Zion listened as he told him and could not help but feel his heart being touched.

He listened knowing full well what it cost Kleb to create it for him, a song that cost him moments with his family, all the strength in his body and finally, a century of magic. 

It's so beautiful Kleb, Zion thought with his heart, so how could I not be touched.