At least you went down swinging.
Playing dead is the equivalent of looking at the third strike.
Swinging from it's mouth. Once you do all that, you incite it's prey drive. Think about it, a Grizzy standing up on it's hind legs looking down at a human waving it's arms and stomping around...
Best case you spook it, worst case your tail is becoming a snack real quick.
Probably the best case is stick near tree lines, and climb a very stout tree.
There is an account of a game warden who went to investigate a elk carcass, and the grizzly came running down at her. She played dead, he bit her a couple times, and she hid her face...the grizzly left.
She stifled it's prey drive.
Or, you can do this.
There is an account of a man in Alaska who came from a bar...he stumbled home drunk, and laid in the dirt/snow. He awoke the next day, and there were all these bear tracks around him. He apparently attributes him not being attacked and eaten due to all the baked beans he ate and the resulting gas...(this is if I remember the story right).