As far as I could discern, only Nikor is relevant to your quests. Here's an easy way to save him, but you'll need Cryogenic Stasis, as this removes Shackles of Pain. Move in the doorway of the backdoor and Teleport down to the docks, so that the dogs won't eat him during the fight. Engage the conversation with ythe magisters with someone other than your guy who knows Cryogenic Stasis. Mid-convo, switch to that guy and now cast Cryog. Statis on Nikor. Switch back to your convo guy and engage the fight. Ofc you can do this midfight too depending on the Initiative of your team and theirs, but seeing as my Cryo guy was last in queue and I was really low level for this fight, this was the best option for me. I also had Cryo up fairly soon during the fight because of this, allowing me to Unshackle one of my teammates too. Healing Ritual also really helps on this fight, it accidentally saved one of the other guys for me.