Headscratchers / The Green Inferno

• How did Amy figure out the meat came from Samantha? She looks in the bowl but I can't make out what she sees.
  • It's a scrap of skin with one of Samantha's tattoos on it. Some of the tribe's children are also seen playing around with bits of tattooed skin as well.
• If Alejandro claims to not waste battery on phones, why didn't they just bring a USB charger?

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