A grizzly will bluff charge a person and it's not fun your aiming at the bear and just waiting the bear turns and runs off then the grizzly comes running back towards you the bear stops about 60 yards out turns and runs away from you again I am still standing there shotgun up and ready to fire the bear disappears over the hill I wait for 10 min nothing to see myself i would had let lead fly at the grizzly if it kept coming at me at 40 yards that's close enough for me ,,I have had a few times that a grizzly bear will bluff charge you but you only let him come in within 40 yards of you and if the bear at 40 yards is still coming make your shot placement count because you won't get a second shot..