Synonyms: First sight
The character can analyse a person at first sight
The character knows how to collect information by briefly looking at a person, he has a great capacity for analysis.
He does not detect lies particularly well, but will know if a person is disturbed, tired, uncomfortable, brutal, cruel, too sure of herself or others.
Among other things, it allows to determine the Feats another character has (if any)
The common man has no Feats at all.
The character must actively analyse the person in question and his diagnosis is not infallible.
In particular, the character can not unmask a character having the Trickster Feat