That's a possibility! There's also the fact that while Vriska's not exactly going to be looking to kill outside of self-defense, she's definitely not going to be going out of her way to avoid fights, either-- so it'd be possible for her to misconstrue something Belle did as an attack attempt, and react with deadly force. I'd be equally fine with that as I would be with accidental killing (Vriska's gun goes off wrong, etc.), or the Gold angle. Do you have any preferences?