"They say elves have the ability to track people. Even long after the people have left their original location." 
He bowed his head and rubbed his nose a bit. 
"So after we get that thing he needs..." 
He clenched his fists.. 
"I want you to help me get my sister back... " 
His gaze turned to the bushes as he hoped not to cry and lose face. 
"But i don't plan on doing that on its terms. letting it get away with what it has done to her."
He sighed. 
"I want to sneak in and free my sister. I don't trust it for one second and if he threatens us or goes back on his bargain, we can still threaten him with the thing he cares about."
He hesitated.
"...But for that... I would need to get my hands on that thing first. And that's were you come in. I need you to relieve Sargom of it."