By the end of Noroi , you realize the characters were doomed not because they were stupid, but because they followed logic. The curse operates like a virus: knowing about it spreads it. Watching the documentary (the film itself) becomes a dangerous act.
In the final sequence, Kobayashi and the remaining psychics perform a "Sumo ritual" at the site of the ancient shrine. They realize too late that Kagutaba is not trapped; it is being broadcast. noroi the curse vietsub full