LOS ANGELES "Final Destination: Bloodlines," the latest installment in the horror franchise, made a grisly splash in North American theaters this weekend, taking in $51 million to debut in the top spot, industry estimates showed on May 18. "This is a sensational opening for the sixth episode of a horror series," said David A. Gross of Franchise Entertainment Research, adding that critics' reviews and audience scores were "excellent." The previous film in the franchise, "Final Destination 5,"