" It was a time for reflection. Jebel had regained some of his vitality and was mildly excited to be closing in on Tubaygat. But he was troubled too and often fell to studying Tel Hesani, trying to imagine himself driving a knife into the Um Kheshabah's chest or slitting his throat.
It had been easy in the beginning. Tel Hesani was a slave, fit only for execution. Now Jebel considered him a friend. Could he brutally end the older man's life and send him to the hold of Rakhebt Wadak's boat?
Jebel knew that he must, or the quest would have been for nothing, but he wasn't sure that he could. He prayed to the gods to steady his hand when the time came, but he didn't think they were listening. In a strange sort of way, he almost wished they weren't. "

― Darren Shan , The Thin Executioner