Well, if it helps, they're pretty noisy, and whatever they say sounds a bit distorted.

[ It's the best identifier for someone that can't see, right? But at least the guy should probably be able to tell that Shizuo was moving so that he was more behind Ao, instead of right to the side or in front of him. Just to stay out of the way of the attempt. He's maintaining the same distance, though. ]

Sometimes it takes a few tries to be successful, even if you're doing it right.