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"Jihadi John."
In the piece, Espinosa, a correspondent for the Spanish newspaper El Mundo who was held by the jihadist group for several months, recalled in vivid detail how infamous executioner "Jihadi John" would psychologically and physically torture his victims.
"Feel it? Cold, isn't it? Can you imagine the pain you'll feel when it cuts? Unimaginable pain," the notorious militant would say as he tickled Espinosa's neck with a long knife. "The first hit will sever your veins. The blood mixes with your saliva."
"Jihadi John" also staged mock executions for his hostages, whom were often captured in Syria by the Islamic State (also known as ISIS or ISIL).
"Jihadi John wanted maximum drama. He had brought along an antique sword of the kind Muslim armies used in the Middle Ages," Espinosa wrote, according to The Telegraph. "After finishing with the sword he holstered his pistol, a Glock. He placed it against my head and pulled the trigger three times. Click. Click. Click. It's called a mock execution. But not even this terrifying intimidation seemed to satisfy them."
"Jihadi John," gained infamy last year after appearing as the executioner in Islamic State videos, including those where US journalists were beheaded. In February, The Washington Post identified the militant as Mohammed Emwazi.
An Islamic State defector told Sky News last week that Emwazi was the "boss" in the jihadist group's hostage operations. According to Sky News, the mock executions had a dark purpose: to make the hostages more relaxed for their ultimate execution videos.
"The execution rehearsals took place so that when the moment of death finally came, the hostages were not expecting to be killed and were relaxed to appeal for their release on camera," the outlet reported.