DC's Batman is known by comic book fans (and by fellow heroes in-universe) as the crimefighter who can defeat any opponent — so long as he has enough time to prepare. He's also known for his paranoia in regards to other foes and even friends; he very famously has contingency plans on every member of the Justice League in the unlikely event that his allies turn to evil.
With all this in mind, it's quite surprising that the Dark Knight made one of the worst mistakes possible that ultimately
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