It was not clear what led the unidentified individual to put on the costume, which included a head, and get close to the bears. “As you can imagine, that’s a really dangerous thing for the guy to do,” Koch said. Spectators were standing at a safe distance and watching the grizzly and her cubs at a weir, which is a barrier on a river, Koch said. People often go to the location on the Chilkoot River to see bears feeding on fish. Suddenly, the man in the bear outfit appeared, startling some of the spectators who feared he was a real predator, said Koch, who did not know whether the costumed man was walking on all fours or two feet.