Too bad he couldn’t have taken his shot when it was 75 yards away from him.
Maybe concerns that the grizzly is protected by the Federal Endangered Species Act and they are aggressive in prosecuting it recently stalled his reaction. See http://www.mnn.com/earth-matters/animals/stories/prosecution-for-fatal-grizzly-shooting-sparks-debate
Such a law is evil when aggressively prosecuted, for this very reason.