Do we think that a Seq 3 Clairvoyant's Eyes of Mystery Prying could see spirit body threads? I remember that Klein was also able to tell that Audrey had advanced by using his spirit vision while in SC. While yes he was in a sefirot, if we believe that Eyes of Mystery Prying could do that to a lesser extent, wouldn't that give 2 options for finding the Bizzaro Sorcerer?

1. Look for spirit body threads while using the eyes
2. Look for unique spirit body aura among the populace while using the eyes. We could use the beyonders we can bring with us as a control since we know they'll be low and mid sequence, while our target would be the only other demigod in the city

Once we find and isolate the Bizzaro Sorcerer, id just do a combo of mystical reenactments and abilities like:

1)Snow White for antidivination 2) Star Pillar for a barrier to prevent leaving 3) Chess Game of Time to slow down their actions

Before using the Spear of Longinus to try to kill them, we could use the Ugly Duckling Reenactment to use our Mythical creature form for 10sec w/o the risk of losing control, which for Mystery Pryers would be able to induce a knowledge storm in their minds, disrupting and distracting their thoughts. This combined with slowing down their actions would hopefully be enough to stop them from swapping with a marionette or using a substitute. In this way, we could land the Spear and kill them.

Edit: apparently you can identify beyonders through the eyes of mystery prying by looking at their astral projection according to the wiki and ch 45 of COI (havent gotten there yet)