Of course. If you're primitive to believe in tokens for luck, why not carve them out of human bones?

[His voice is wry. Garrus wouldn't really be surprised if it's true that Corvo's people carve up human bones as good luck toys.]

So is it more or less lucky if they do it out of enemy bones? My bet's on less, but considering humans and their vendettas, I can see them trying to sell it as more.

[He's still half-teasing as he talks, leaning forward as he waits for Corvo to be ready.]

And then you carve up the wrong enemy and you're boned.