A Wisconsin Dells amusement park is back open after a man fell off a roller coaster last night, but there are still a lot of questions left unanswered. We still don't know why it happened, or how the guest is doing now, but we do know the 64-year-old man was airlifted to the UW Trauma Center Thursday night. He was at the Mount Olympus indoor water park, on the Opa! ride around 5:30 p.m. Thursday when police say he fell nearly 20 feet off the ride, hitting the ground. We spoke with the state agency investigating the situation. They say investigators were out on the scene all day today, but wont have a report until sometime next week. They say the ride's manufacturer is coming in to conduct it's own investigation. The state says that the ride will be shut down until further notice. The amusement park is open now, it just reopened around 4 o'clock Friday afternoon.