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Dude... i blacked out once ( blood loss ) and once i've been knocked out also... Do you know what I felt at that moment? NOTHING.I blacked out and pretty much believed I was going to die.
You dont hear sounds, you dont feel pain, you dont see anything (not even black), you can not think or feel anything at all. It's something that happens instantaneously, you dont even realize that its happening, it does not leave you room to think or feel. It's like looking at the clock, blink, and suddenly time passed and in the middle NOTHING.
So, if at that moment you "believed" that you were going to die, there is inaccuracy in what you are telling, or you are lying.