In training, various techniques are usually practiced until they become second nature. For example, judokas practice the correct fall. But that's only in theory.
Once, my classmate fell very unsuccessfully right onto the ice after training.
You know, this skull, which is about four millimeters thick, is not the strongest thing in the world. It's very easy to feel that when, for example, you have a child with you - you instinctively pay extra attention.
Since then, I haven't communicated with him much. At that time, he was fine; he seemed sociable and friendly.