Kneeling, Aaron gives the bounty hunter a cold look before turning his attention back to the dead caster. "May your journey to the after life be warm and bright, and should you need guidance, allow Gracenys to lend a hand if you are found worthy."
Turning back to the bounty hunter, he states, "So you chained him down, and let him die from the cold. When the others arrive, you will bury him properly. This is not a request either."
Grabbing at the chain, he frees the frozen corpse. Aaron then inspects the area for any magical items or the casters book, so that perhaps the others might make use of this fallen one's knowledge.
(OOC - not sure what he would have time to die, as burying him would take too long. Might as well take what they can use and be on their way.