A video camera recovered at the site proved to have been operating during the attack, but police said that the six-minute tape contained only voices and cries as a brown bear mauled Treadwell to death. The tape begins with Treadwell yelling that he is being attacked. "Come out here; I'm being killed out here," he screams. That the tape contained only sound led troopers to believe the attack might have happened while the camera was stuffed in a duffel bag or during the dark of night. In "Grizzly Man", filmmaker Herzog claims that the lens cap of the camera was left on, suggesting that Treadwell and Huguenard were in the process of setting up for another video sequence when the attack happened. The camera had been turned on just before the attack, presumably by sound activation, but the camera recorded only six minutes of audio before running out of tape. This, however, was enough time to record the bear's initial attack on Treadwell and his agonized screams, its retreat after Huguenard tells Treadwell to play dead, and when she attacked it, and its return to carry Treadwell off into the forest.