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and explains why people haven't been talking. they were told by isis if they talked about their captivity, all of the remaining captives would be punished. there is essentially only one captive left and that's why javier wrote this piece and talked about it. >> reporter: espinosa was held with more than 20 other western hostages in syria, including americans james foley, steven sotloff and kayla mueller who are all now dead. espinosa says kassig told him of his own torture saying when they realized i was american and that i had been a soldier in iraq they went crazy. they hung me from the roof and started beating me. i thought they were going to execute me. sometime later, he was beheaded. the gruesome video posted on the internet. an isis defector who witnessed some of the beheadings also said during a separate interview with sky news that isis reveres jihadi john as the quote, big boss who is the only one in the group allowed to kill foreigners. wolf? >> pamela brown, thanks very much. joining us now, our cnn counter