Audio problem: In the opening heist sequence a clown grabs a bald bank teller and the teller says "Please no, no!" while being thrown over the counter, however, his voice doesn't match his facial expression. His voice is loud and terrified in fear and yet his lips and face expression barely react. (00:02:55)
Audio problem: In the scene where Alfred is stitching up Bruce, Bruce says "I wanted to inspire people." As he says "people" the shot changes and his lips aren't moving, but the audio track continues.
Answer: It's habit, and a sensible one at that. When he's in the mask, when he's being Batman, he uses the voice, even if the person he's with knows who he is. If he drops back to his normal voice with some people, it sets the precedent for using it while wearing the cowl, which means that he's more likely to slip up and use it around people who don't know, potentially revealing his true identity. If he sticks rigidly to using the voice when kitted up as Batman, regardless of situation, it minimises that possibility.
Tailkinker ★