early-episode-weirdness cannot be dismissed: it was only GP.
and of course Harry's an unreliable narrator.
That's the thing though isn't it. A soul gaze is a two way street, the wizard's sight isn't. In a soul gaze the gazer opens his or herself up equally to the person who's eyes he or she is gazing into. Susan fainted during her soul gaze with Harry, Marcone took his own measure of Harry, at that point in time neither Marcone nor Susan had any magical ability to be able to read Harry's soul. If either Susan or Marcone at that time looked into another vanilla human's eyes it wouldn't result in a soul gaze because they weren't wizards.. Marcone can now presumably, because he is now a wizard.
Sight & Soulgaze are far more alike than they are dissimilar; the entire section of the WoJ-file I just quoted from is about "3rd sight and Soulgaze" and it's clear from the various Q&A that their same-ness was a common assumption on both sides.
Are they? I think they appear alike because both give information, but they are not alike.. Here is why, in a trial before the Council the arresting Warden or whatever Warden is in charge of the prisoner performs a soul gaze on the prisoner, and testifies as to what he or she saw,
it is admissible evidence on the character and guilt or innocence of the prisoner. However the wizard's sight isn't permissible in court because it is unreliable for the following reasons.
The Third Sight is different for everyone, subjective, and inherently slanted towards ones own experiences and background. So while two wizards might look on some totally-gone, bloodthirsty warlock and see a bloodthirsty warlock, they might see it in very different ways.
... Harry looks on him and sees some Hannibal-Lectery figure crouched on the floor grinning and soaked in blood.
... Ancient Mai looks on him and sees a bare, twisted white tree in the center of an unbroken field of white snow, representative of the individual’s loss of spirit and humanity.
... Rodriguez looks at him and hears some kind of hideous music that accompanies the individual and makes the hair on the back of Carlos’ neck stand up...
... Listens-to-Wind looks on the warlock and smells something rotted and vile.
That means the evidence from the Wizard's Sight is completely prejudicial based on the gazer's own biases and experience. However this apparently isn't the case with a soul gaze. Did the Merlin insist on a collaborative soul gaze of the Korean Kid before his head was chopped off? Not in the book anyway, the Merlin simply told Harry that he had soul gazed the Korean Kid himself and he found him to be guilty of many crimes.. However if the Wizard's Sight was like a soul gaze. from the above quote Harry or Eb or some other wizard could have seen the Korean Kid in a totally different light.. Yet the kid was found guilty and killed on the strength of a single soul gaze. Where as I doubt it could be done on the strength of the above reasons, each wizard sees different things when looking at the same thing with the sight. So while they appear to be the same, they are not.
I'm asking, can a sufficiently-strong and/or sufficiently-experienced Soulgazer just look into somebody's eyes and NOPE the forming soulgaze? Just... turn it off, by force of will or mental discipline?
Yes, it can, several times in the later books Harry speaks of feeling the beginnings of soul gaze with someone he doesn't want to have a soul gaze with and he breaks it off. We all know the strength of Harry's will.