When Demetri was in the FBI office with Janis Hawk, he mentioned that he met a woman that day who didn't have a vision and five minutes after that, she was shot and killed. He was referring to Sheriff Keegan. However, earlier in the show, when Sheriff Keegan told Demetri and Mark she didn't see a vision, it was during the day where it's bright and sunny. She was only killed at night in the doll factory where it was very dark outside. It is definitely more than five minutes from the time Sheriff Keegan told them about her not having vision to the time she was killed.