I remember reading this back in '86 when Batman 400 came out. Was thinking about it due to a thread Batman's being discussed in.
Found this article about the intro...

http://talkstephenking.blogspot.com/2012/03/batman-400-batman-or-superman.html?m=1

And here are scans of the intro itself, not sure of the quality...

Thought this might stir up conversation on one of the best characters ever...👆