You can let an NPC get eaten first. I think Ishirou would look tasty with his big muscles. If they haven't made it into the camp yet, you can have Pezock intercept them a bit short of the compound. If they need help escaping you could have the woods whisper to Aycenia that there are beings that could help with her quest. She could show up at night and offer to help if they are willing to accept her quest. The cannibals may feel blessed with the bounty and lower the PCs into the Caves of the Mother as an offering. They don't get their weapons or armor, but you could place some stuff for them to use like large bones that could be clubs or sticks.