[] Hank seems to have taken his master's betrayal quite personally, maybe you could be allies... he is no worse than a Count of the Red Court and his band
How relatively bad the guy isn't as relevant as how crazy he is. Molly does care about the ethics, but even if we could justify it he's too psychotic to trust unless you've got a knife to his throat. Even then I think he'd test the edge, after what the Naagoloshii did to these guys he couldn't help himself.
Indeed. No way should we ally with him. Too unstable. I don't think we should kill him either - he's too mentally unstable to be considered fit to stand trial, I feel, and is in need of mental healing.
A rabid dog didn't ask to have rabies, but it's still a danger to everyone around it and can't practically be treated.
This guy is a threat to Molly's grade of combat ability. Trying to save him from himself when he doesn't want it is a lawful stupid level decision that will almost certainly end in tears.
More globally... Get into more debt with Odin and call for mercenary backup?
Being that dependent on them is a lot of leverage to provide Odin, and heavily implies we're incapable of handling ourselves to someone we'd prefer take us seriously.
fuck no we are literally giving them a free prisoner with valuable knowledge if anything they owe us. This makes us not only gullible and abusable but kind of stupid. We either kill him or they take the prisoner who likely has info they'll use.
Keeping a prisoner like that is work, and value is driven by context.
Looting this guy for knowledge is a nice bonus for them, but not something they need to do or is necessarily worth the trouble on its own.
More broadly, paying mercenaries with loot alone is like trying to get artists to work for exposure. Sure we provided the prisoner ourselves, but we'd still get laughed out of the room for suggesting something like that.
Dont play the Catholic girl and jump to the most expedient option at first blush.
This isn't cold blooded murder of someone at our mercy, it's a fight against someone legitimately able to kill us who's currently at a disadvantage. He's also violently insane and very difficult to keep contained, especially when we're on a timer like this.
If containment does fail then he's bound to hurt more people too.
Remember Charity's advice; kindness to people like this is often cruelty to their victims.
The idea odins people can't hold him is kind of ridiculous ngl.
Not at the drop of a hat like this. What, is Piotr supposed to keep this guy down till help arrives? Who do they have on hand that can handle it, because at this point we're talking about what's essentially a beefy wizard grade talent with personal training from a fairly powerful supernatural entity.
People who can safely hold that down without killing the target and keep them that way, to say nothing of the resources they use while doing so, aren't common.
They have them, but mobilizing them is a different matter.
Asking Odin to make a personal visit, even effectively on his own doorstep, is a pretty pricey thing because his time and effort is valuable. So the simplest solution here is also the one that costs the most for everyone involved.
Cause he's basically have to babysit until other containment measures are ready, potentially taking up a notable amount of his time.
Why are you guys worried about holding him.
Its trivial to hold supernatural creatuers in dresden. Just pur them in a strong circle. They can't break them from the inside. It has held beings like the erlking, a shapeshifter isn't breaking out.
Circles are the real OP bullshit.
That isn't how it works, or rather you're drastically oversimplifying it.
Making a powerful circle is an art unto itself, and binding things inside one while they want to get out can be complicated and energy intensive.
This is especially true for supernatural but martial entities, because you need a layered array of circles since different ones only block a single thing at a time. This was established in Fool Moon for the cursed shape shifter, who needs a dedicated set tuned to physical and magical power to keep held down.
That thing was mindless and still broke out.
This guy is a caster under all of this, a variety of mortal wizard. Which means unlike summoning particularly dumb demons he could credibly know the best ways to resist and escape from magical containment, making holding him harder.
Monoc probably can, but these things make the effort level and rarity of resources involved go up.
1) Not insane. Murderous cannibal yes.
The guy promised to eat Molly's heart while she had him telekinetically bound. A supernaturally effective sadist dragged his entire community into the spirit world and tortured them until they were reshaped into what we see here.
Maybe he's not totally out of touch with reality, but I wouldn't call him sane.
2) Michael is Molly's Mentor 5.
What Would Michael Do is a fundamental consideration of Molly's morality in this quest, even when she doesnt follow it to the letter.
Its a lodestone. You cant hope to keep enjoying the benefits while acting like a warlord out of the Thirty Years War.
Mentor 5 means he has influence, but what we take a what we leave aren't bound to whatever he'd most prefer. Mentorship isn't a blood oath to do only as your teacher would. Micheal and the white god are certainly not going to drop Molly for not completely conforming.
You're also presenting a false dichotomy here. The options aren't Micheal or Mongol Horde, and this isn't acting some obvious case of murdering for simple convenience.
Innocent lives are on the line, this guy is a threat who's demonstrated he could slip loose and make a credible attempt on Molly's life at least once under these exact conditions, and our only option for containment is a time consuming gamble which could have great personal consequences if it actually works.
Just getting Hank to Odin is a notable risk to Molly and the people who the Naagoloshii is hunting right now.
Supposing we do get him there, and Monoc can hold him on short notice at a price we're willing to pay, we could still end up with one or more people being tortured for entertainment like what happened with Thomas by the time we get back into town.
[X] Kill Hank as efficiently as you can, the world is a better place without his madness and you need to get back home 
