Ruby.
I'm not going to hurt anyone that I care about. It's the whole reason I'm going into all of this. I need to stop him. It'll give us time. He'll be convinced that I'm doing what he wants to do for him, so he'll leave them alone. Then we can work on finding a way to jam that awesome knife of yours into his back.
You want to get involved? Fine. You're in. I'll just tell him that it's a packaged deal.