Who is it?
This would be the greatest sucker-punch in the world. Who has the largest amount of experience as Batman, short of Bruce Wayne? Yeah, sure... maybe he let a murderer die, possibly condemning his last victim to a slow and horrible death. Okay, he's got moments where he goes just bat-sh!t crazy. But I think I would applaud the sheer cojones a move like this would require.
Who says nothing good happened in the 90's?