User blog comment:Aegis Runestone/Does anyone else dislike Lucy being... *spoilers*/@comment-87.169.97.164-20120421215416/@comment-1888015-20120421222347

Eagle Vision might not work like that. It's unlikely that it's based on "Turn on eyes, learn all the world's secrets."

It's probably based on instinct, as Desmond thinks of Lucy as an ally at that point, and so she appears blue.