Awesome! Good question, and that's something I'm addressing in the updated version that should be up soon. I'll post what I've got so far here so you can use that. Long story short: combat is incredibly fast and brutal, should just be 1 roll.
"So what happens when a Bird decides to hurt someone? You’ll most likely be rolling Murder, plus any relevant Domain depending on the target or location. NPCs don’t have hit points to whittle down here. The assumption is that if you try to Murder someone, and you succeed, they are murdered. This is especially the case for most run-of-the-mill goons out there. If you are facing a particularly formidable or dangerous foe, maybe you have to hit them a few times before they drop. But I’ll let your GM decide that."