"I'd like to make swords all the time, but -" she pauses, and the apprentices, as if on cue, sing out:

"The naiiiiils!"

"The nails," River agrees. "...When you say wolf you mean like a werewolf, or a shapeshifted wolf, or..." Beat. "Not that it's strictly my business but I'm trying to make sure I don't uh. End up making something that might burn or poison you or something."