To tell the truth, I never thought about how Azhar would get free.
The rider had one end of the chain in his hand. The other end was attached to those iron manacles that are locked on the girl's wrists. He probably looped his end of the chain around the pommel of his saddle or something like that. You could have the slaver drop the chain or have it come unattached from the saddle. That's possible. Then Azhar will be free, even though she's still dragging the chain.
You could do what Child said....take a hammer and slam down on the outstretched chain if you want to cut some of that off. Or you could just leave it and drag it along. I vote for Lindir to get the whole thing off once the fight is over.
If you can come up with another idea, I'm certainly willing to be flexible here. (sorry about this....)