How much destruction could they (separate realities, one with Bane and one with Joker) cause with a full army of Prometheans behind their back until they would be stopped?
[Edited on 12.11.2012 10:21 PM PST]
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But.... "Guns are too quick!" edit: and he would use it on bane [Edited on 12.11.2012 10:22 PM PST]