Re: volunteers.
Sera has arrows, but her bow's enchanted with lightning rather than fire so it didn't do the most damage that it COULD have done. So she was laying down some pretty solid cover fire on the outskirts, and I think she was REALLY stunned that this demon was freakishly tough.
For interest's sake 'cause so far no one's getting hurt, I'm going to say that Sera tried to get close to it to use her knockout powder, just to make it go to sleep for a few precious seconds -- and while she DID manage to do that (get your hits in??), she took an ice spike right to the gut for her trouble and crumpled until she made use of one of her regeneration potions, which healed her wound and continued to heal her even as she was being hit again (because the demon was pissed at her, I guess).
The regeneration potion is what saves her life -- and I think it might be neat if someone noticed it and took an interest, potentially? - because she has TWO MORE OF THEM that could be used for plot-relevant reasons in the future if she gave them up to medical, idk, if we wanted to have someone close to death or going into an impossible fight, etc.