Batman has dedicated his life to an endless crusade, a war on all criminals in the name of his murdered parents, who were taken from him when he was just a child.  Since that tragic night, have has trained his body and mind to near physical perfection to be a self-made superhero. In this story, Batman will seem a little more weak than he usually is. He is experiencing a nightmare. He will be acting and making decisions very differently than what you expect him to do. 

I don't care what Batman you do. Just make us believe he is Batman.