Comment by rottendoubt

Someone posted on the original article that "You cannot recall smells..." That is one possibility. Pandarus could give Manelaus a bottle of a very specific perfume that Pandarus was familiar with. If Pandarus smelled the perfume in the future, he would know it was Manelaus. But if captured, he would not be able to remember the perfume's smell -- at least not in a specific enough way to reproduce it.