In reality, humans also have "intermittent bullets", but it is an ultra-low version. I personally had several similar "bullet time" experiences before I was 20 years old. The limit I can do is probably to avoid a swing from a strong junior high school boy (I was the same age as him at that time). I think the experience at that time was very special, so I remember it firmly, and the somatosensory time will slow down (you feel that time is slow, but the actual time has not changed, just like slow motion), and you can't tell how much slower it is. This state lasted for a short time, just like the short time of a swing I mentioned above, and then it returned to normal. Later, I looked up a lot of problems with similar experiences on the Internet. Combined with the experience of many netizens, I think the reason for the feeling of "bullet time" is the explosion of adrenal hormones. The human reaction caused by adrenal hormone explosion is generally that the blood supply to the brain and muscles of the whole body is greatly increased. Hearing loss, pupil contraction, narrowed visual field, reduced blood supply to viscera, accelerated brain operation, and enhanced muscle movement effects such as speed and strength. Apply the computer cpu, the fuselage is overclocked. Later, I recalled the situation. When the somatosensory time slowed down, my visual range became quite serious, and I could only see his swinging arm. I guess the real "bullet time" is a slow somatosensory time. The reason may be the targeted analysis of the brain after overclocking. The human brain is the most mysterious place for the whole world. About 40% of the energy we get from diet in normal life is consumed by the brain. I can't know what the overclocked brain analyzed at that time, just the visual range of one arm, and the overclocked body only lasted for such a short time. After bullet time, I fought back and punched the other side of the door with a straight punch. He was punched by me on the blackboard at the back of the classroom, and I was a little stunned. By that time, "bullet time" had passed. If I was still in "bullet time" when I hit back, maybe I could knock him out with one punch. Unfortunately, in junior high school, he was introverted and obese. Probably because of "bullet time", that is, adrenal hormones broke out. I only hit that punch back, and I didn't have the strength to continue. I was going to tighten the other hand that grabbed his neck (after a punch, my left hand caught it, which is why I didn't have physical violence later. Of course, I can't help it. Later, when I got back to my seat, I felt my heart beating fast and my whole body was shaking. It's like running a 1000m long-distance race, which is very weak. I guess this is probably the energy consumption of my "bullet time". Perhaps people with rich knowledge and experience will be stronger if they have been in the "bullet time" for a long time. I had three experiences similar to "bullet time" later, one of which was almost as angry as this one, and the other two were near-death experiences without any emotion or fear. I think it is almost impossible to take the initiative to achieve "bullet time", because every time I enter "bullet time", I am at the emotional peak that I can't reach under normal circumstances. I have a vague feeling that my brain is actually analyzing all my experiences, then finding out the similarities, analyzing the combination and making the optimal solution. "Bullet time" depends on your physical strength, experience, mood or other places that I didn't pay attention to, to decide whether to appear, the degree of consumption, the duration and the solution. According to my other experience, focusing all my attention on a key point in the incident and pushing my anger out may lead to "bullet time". I can't or don't want to force myself now because I feel that this thing seems to be born for fighting, which is difficult to control and lasts too short. Cool, but not necessary. You will experience it when you are facing death (being hit by a car) and have the consciousness of resisting to survive.