
Originally Posted by
Morningstar1337
Shadowbringers spoilers
Y'stola really should had noticed Emet-Selch as well during the reunion
I think the insinuation in that scene was that Emet had already taken off before Y'shtola appeared after Runar and the Night's Blessed surrounded the WoL and the Archons, that and the corrupted Light from two Lightwardens we had absorbed was like a blazing torch to her aetherically that smothered all other aetheric traces in the vicinity (it was the whole reason the Night's Blessed were there in the first place, she sensed a powerful Light-aspected aetheric signature in that area and assumed it was another sineater in the area, and because it was from sineaters, it drowned out even our own personal aetheric signature, which although Light-aspected, is cannoically blue).
Throw in the area already smothered in Light aether and standing alongside us, Emet's natural Darkness aetheric signature as an Ascian would have hardly raised a blip in her 'aether sight', especially if he was no longer there (he even remarked how the Light was sapping his strength and so he preferred to 'keep to the shadows' usually).
So yeah, it's fairly easily explained why she did not notice him there.