Does hiding block line of sight for observers?

[Ruzihm]

I have a player who is interested in using Lock Gaze and the shadowdancer Hide in Plain Sight feature to hinder opponents while remaining hidden from the target of the spell.

His point of view is that they will be forced to look at him but will not recognize his presence where they are looking (in the way that camouflage can work). It's creative but I'm not sure if that's RAI, so I'm looking at RAW.

Since the spell says that the effect ends once your line of sight to the target or the target's line of sight to you is broken, I think it comes down to the question in the subject: Does hiding block line of sight for observers?

This post (and thread) asks that question, with no direct response. I'm inclined to agree that it does break line of sight (but not necessarily line of effect) from any observers who fail vs. the stealth check.

[Hendelbolaf]

If you cannot see a target because of invisibility or stealth or whatever, then you do not have line of sight. You may still have line of effect, but it seems like once the character with the Hide in Plain Sight goes into "stealth" mode, that the target would suffer no ill effects per the spell description.

[Kyoni]

Lock Gaze wrote:

If you willingly leave the target's line of sight or become unconscious or dead, the spell creature suffers no ill effects.

As in: he needs to be able to see you. If you are hidden, he can't see you. Thus the effect stops as soon as the player hides.

Imho spells like blurr would work, but hiding definitely does not.

[Ruzihm]

Makes sense to me. Bumping just once to see if anyone responds in favor of an alternative interpretation.