The reason I've suggested infiltrating a team of scout snipers into Zion is that RFC has set the stage for something like it. One of the cargo lorries in Nimue's cave has been modified so it has seats to carry several people rather than cargo. Why would RFC slip in that little tidbit if he didn't plan to
use it eventually?
(Because we all know that he's sneaky and devious and that he
loves to plant false trails all over the place, and then he laughs at our predictions!)
However, if this isn't one of his false trails, one of these days that lorry is going to come in handy. It may take the Sisters of the Snow for a quick trip to Nimue's cave. It would come in handy if the agents of the Fist of God need to escape from Zion quickly. (Which may be what Aivah was hinting at when she told Merlin that she needed to travel to Zion in a single day.)
A platoon of scout snipers scattered on rooftops surrounding the Plaza of Martyrs could have lots of fun "cleansing the vicarate" on a day when Clyntahn and his merry gang of inquisitors lead the latest group of heretics who've managed to survive the Punishment to the stakes for immolation. Of course we don't want Clyntahn to die that quickly or cleanly!
Those snipers can do something that PICAs can't - get close enough to the Temple to do some meaningful sniping. Once smokeless powder is available (which will also increase their range and accuracy) escaping after taking several shots won't be too difficult, since the small amount of smoke won't be easy to spot. Shoot through a window inside a building, and nobody will see the smoke at all, and no one would know where the shots were coming from unless they were looking in just the right spot and saw the muzzle flash.
It's the sort of attack that you could only get away with once using large numbers of snipers, but during that assault they could shoot any servant of Mother Church in the plaza (and also those horribly mangled by torture to give them a quick death) until they ran out of targets. It would also be the
last time prisoners were burned at the stake in the Plaza of Martyrs.
After that the Inquisition would be forced to post spotters around the plaza looking for the smoke and muzzle flash of gunshots, and post others by the buildings around the plaza and on the rooftops to prevent future snipers from getting into position (or escaping from) another slaughter.
The most enjoyable prospect of striking at the very steps of the Temple itself is that no priest, inquisitor, or Temple guardsman could cross the plaza again without wondering if a bullet was coming his way. That could happen now and then, since the Inquisition couldn't post men on every building around the Temple in every sort of weather every single day!
Lather, rinse, repeat at random intervals in random locations. Outside (or inside of) vicar's houses, churches, monasteries, brothels... It wouldn't be long before no vicar or inquisitor would dare walk the streets of Zion wearing his ecclesiastic garb. The Temple guard would have to go incognito as well.
Can you imagine Clyntahn's frenzy once no official of Mother Church was safe on the streets of the most holy city on Safehold? Especially since attacks within Zion itself are supposedly impossible due to all the holiness oozing from the Temple or some such nonsense. (Although I have to admit that the corpses would be a lot more
holey after they took a bullet or two!)
Of course there is the non-trivial problem of wandering the streets of the world's largest city with an M96 sniper rifle in your hands while speaking with a pronounced Charisian or Chisholmian accent. I guess Zion's orchestra could receive a large influx of foreign violinists. (Nah, the cases wouldn't be big enough. Better make them bass players.)
Should the snipers escape without being identified, the "seijins" could claim credit for the attack to "cleanse the plaza of those who have corrupted Mother Church and to release their innocent victims from suffering." This is the sort of pinpoint assault that Nimue could really get excited about.
Since the demon Murphai (
not the seijin by the same name!) always seems to rear his head, the snipers had better carry cyanide capsules and be able to get to them quicker than some yet to be named woman we've heard of...)
RFC is the mastermind, so I leave the details of how the snipers successfully escape to the waiting lorry up to him!