All right, loud mouth, ready to test this thing?
No guarantee it'll work yet but it ain't gonna kill you.
[Private to Castiel]I'm assumin this is the way to get ahold of you. I've had a breakthrough with the vampire cure. I'm certain it won't kill him but I'm not so sure it'll actually work.
So... you can bring him here or you can bring me and the cure there. Either way, I have to be involved to collect data and make whatever adjustments may be needed. Non-negotiable.