Cast of Haunted house at theme park was punched

A 19-year-old university student and his colleges walked in a haunted house. Then they found a guy sitting there. Suddenly the guy stood up and amazed them. The student got surprised at him and found himself punching the guy.
A police arrested the student suspecting that he punched the cast one time. The student acknowledges the suspicion and regrets doing it.
The theme park is called NOBERUSA and has the haunted house "Yubikiri no ie(A house for cutting off your fingers)"

News sauce : Asahi newspaper