Originally Posted by hafizbat
I feel a bit dumb for asking, but what did the EMP gun even do lol? It looked like he shot at the biker and missed? What is the purpose of the EMP gun? And didn't he have the same device in his belt when he killed the lights in the sewer fight with Bane? Lol sorry for the confusion, it seemed like a cool gadget so could someone explain to me what the EMP gun was for
He was using it to knock out the lights in the parking garage as he drove under them. It kept him hidden, gave him the advantage of darkness. Also provides a badass element of terror and theatricality. One of the more impressive 'Batman' moments from Nolan, in my opinion. Shame it was so brief and unexplained.
He fires it at one of the motorcycles, but an EMP wouldn't shut down a motorcycle (they certainly didn't look like electric bikes), so I'm guessing he was aiming for that little tablet he picks up later to shut off the process that he wound up being too late to stop.
This is assuming he knew about the tablet before he picks it up from the thug later, of course.
Otherwise, it doesn't make any sense to fire it. It just makes a bunch of ineffectual sparks.