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A project manager today told how she begged the train knifeman to spare her life, before he told her: "The Devil is not going to win." Dayna Arnold, 48, boarded the London-bound LNER Azuma with her partner, site manager Andy Gray, 37, but within minutes saw the horror unfold. The couple were sat in Coach J at the opposite end of the carriage as the attacker when he launched the eight-minute bloodbath which has left two people fighting for their lives. She said she was separated from Andy as people fled for their lives and when she fell to the floor the she pleaded "please don't" as he stood over her with a 6ins kitchen knife. Dayna said today: "I was running and when I looked back I saw the knifeman running after me. I fell down and I just said, 'Please don't kill me'. Something shifted in his face and he just carried on. He said: 'The devil is not going to win.'" She added: "We just feel very lucky today. If we had been sat at the other end of the carriage, we'd might not be here." Andy - still wearing the blood-splatter knitted jumper - today said that he first saw the violent attack just minutes after pulling out of Peterborough station. He said: "We were on the same carriage. Within about five minutes we just heard the panic and commotion in people's voices. "I didn't see him but I saw the knife moving, plunging. I pushed Dayna but we were seperated. There was this young lad who was abotu 19 or 20. "He had gashes on his arm and a severe puncture under his arm. There was a lot of blood coming out of him. He said, 'I've been stabbed, please help me'. It looked like an artery had been hit. I took off my belt and made a tourniquet. He was saying, 'Please call my dad, I don't want to die'." Dayna and Andy fled the station and were given a complimentary room at a nearby pub. Today they returned top Huntingdon station to travel down to Milton Keynes. Andy said: "I still have [the victim's] blood on my jumper. I heard there were two people critical so I hope we saved his life."