User blog comment:MrGrey27/The Thief And The Butcher/@comment-24.51.64.107-20140805142925/@comment-107.77.80.45-20141113203720

But if we remember the scene, it was Mercury who delivered the killing blow. I think it is an insinuation of their purpose there, and using "there's little reason to believe they're not both assassins" isn't much of a counter. If they were going for obviousness, they would have had Emerald ask for "Two Assassins", but since she was specifically characterized as a thief, I believe she is alluding to their purpose.