Suppose this person is extremely perceptive, but still a normal person, no spidey sense. No Jason Bourne-like abilities either. So, heightened-but-within-the-realistic-bracket senses. How realistic is it for him or her to hear a faint ..something that alerts him of the danger? Hollywood movies show bullets speeding at you with a buzzing sound, but we all know Hollywood is to realism what North Korea is to democracy. So I'd like to hear what people who are more knowledgeable than me has to say of this issue. Thanks.