To use the disruptor in batman Arkham city you will have to upgrade. You can then use gadgets against firearms.
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It depends if it's your first time or second time fighting him. But first time you must be over head to glide kick him and second time your must use corner cover then throw your batarang when his head pop out from beind the doctor.
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The moral behind the creation of Batman has to be the fact that good always over-powers and conquers evil , or something related to that . Batman stands as a symbol of hope and faith , that one day there will be a world wilout crime . Batman also gives people a reason not to be afraid of criminals and killers .
Batman's alter ego is practically his identity which covers him being Batman. His alter ego is Bruce Wayne.