I've noticed on multiple occasions since playing with this skill more recently that my Companion sometimes "inherits" a chain from a baddie I just killed. I've even seen my char inherit the chain once. What's worse, it seems to slow the Companion and subsequently increase the damage the Companion takes from baddies since I also have Cull the Weak going. I've seen the chain attach to the Spider and the Wolf. I'm pretty sure they're fighting the baddie they inherit the chain from when it dies, but not 100% sure.
Edited by chamr#1696 on 12/27/2012 2:55 PM PST