[Jacob nods and takes the arrow. He checks the paper again to make sure he's doing everything correctly. Finding that he is, it puts the bloodied tip into the red-black liquid.

It bubbles and hisses; steams and smokes. Some of it splatters onto the counter, but by that point he's already removing the arrow.]

Alright. Next... you drink that. That's it- apparently. After that you have until the next full moon to go back on the deal. If you don't, the deal is official.