yeah, even if ppl call that part DEEP, it was a cool part, you can see his hands shaking when he's taking the guns, as if he was wondering "what are this guns doing here? were they used alredy? did they killed alredy? how many people has this guns killed? how many criminals escaped from my grasp? how many people i was unable to save?"
still, i actually think that what alfred saw was batman with his hands empty, but still, his hands were placed as if he were holding something on them.