He then enters the mutant family's cabin and finds the old gas station attendant, who reveals how the cannibals' mutations were caused by inbreeding and effluent dumped in the river from an abandoned paper mill 30 years ago. The man, who is revealed to be the grandfather of Three Finger and the two other inbred mountain men who have been killed, attacks Dale to avenge their deaths.
After entering the mutant family's cabin, Dale encounters an old gas station attendant who reveals the cause of the cannibals' mutations: inbreeding and pollution from a nearby paper mill that released waste into the river 30 years ago. The attendant is revealed to be the grandfather of Three Finger and the other two mountain men killed earlier, and he attacks Dale for revenge.