"Silencer" is a misleading name. "Not-injure-ears-er" is more accurate.
The shot is still really loud, but not painfully so. More advanced silencers are physically constrained by the fact there's an explosion and a sonic boom happening,
[X] Try to trick him. (Manipulate + Empathy)
-[X] This man is a talker. Get him talking. Get him ranting. There's nothing so chatty as a man who wants to explain in detail why you're wrong. If you get him detailing what is going on you should be able to pick some clues from it all, or at least give you leads.
Um, maybe we should not threaten to mess with Souls via hellish powers with a white council wizard and knight of the cross in the room? Esspecially if were trying to convince them were not about to fall off the sliperry slope?
We are threatening a Nazi. (Nazi, Necromancer, Kemmlerite, Warlock and wannabe-puppetmaster who send people to their death against a knight of the Cross)
Anything goes for that.
Besides dad will trust us if we tell him that we can't actually do that.
As for wanting to do it, I strongly suspect that from a christian perspective he will go to hell if we kill him now, does it matter which one?
I would like to try to answer or at least discuss this in some detail, because this is a tricky question that gets into both Christian theology and the weird Dresden Files setting alterations, where Jim Butcher sometimes can't make up his mind about how it works and there's continuity drift.
1. Christianity teaches that the Creator gets
final judgment on everyone. No matter what you believed in life, no matter what pantheon you were affiliated with, no tug-of-war for souls. This is weakly supported by Jim's 'Uriel can easily destroy galaxies' statement which puts Uriel in a different league from just about everyone else, and implicitly the Creator well above that again.
(Back when Greco-Roman and other pantheons were more of a serious concern IRL, Christians would speculate that they were angels who had deserted from the War in Heaven and set themselves up with a fun gig on Earth.)
Going by this, fey contracts or Exalted prison-charms or whatever might get someone for ten thousand years, but the Creator has the last word, no ifs, ands, or buts. So no, it really doesn't matter where you send him now because he ends up in the same one
eventually.
2. Despite that, it is not "anything goes", because one's actions influence the state of one's
own soul. It's fine to execute him for being so evil and dangerous, but certain things are off limits to do to any human, at all, broadly similar to the DF Laws of Magic. DP might have another reveal in store where the nazicromancer doesn't count as human and doesn't have a soul any more because mumble mumble dark rituals, but that would surprise me at this point.
3. The word "hell" is being used for at least two different things here, so let me use different names for them:
Team Fallen Angels is traditionally considered to be driven by something like envy: they were beings most favored by the Creator, then one day* the Creator made humans and said "you know what, these are even cooler" (heavily paraphrased) and the Fallen Angels threw a temper tantrum about being second-place and decided to ruin humanity. There's lots of violence in there for obvious reasons, but violence isn't the goal in itself - debasing humanity is. Using the power of Team Fallen Angels for any reason is a bad idea because it's not a neutral force.
Team Kakuri is, from a Christian standpoint, and based on what I've seen of the setting so far (insert really large caveats about multiple authors and houserules) not significantly different from channeling the power of the Antarctic and threatening to send the guy to the South Pole with minimal life support so he can freeze his legs off. It is a neutral force, even if it gets translated as "hellish", and using it is judged based on what you do with it. Refer to point 2.
*
possibly the first day, coinciding with the creation of linear time