I remember everything because I didn't go out.
You couldn't have been hit that hard then. Even UFC fighters are caught asking "what happened" to their trainers at the end of the round when they've been rocked. They say they don't even remember the rest of the round a lot of the time after that, even though they stayed on their feet or kept conscious. Adrenaline has a funny way of getting us through vicious situations but a lot of the time, especially duing physical altercations, it's tough to remember wtf happened -- everything happens so fast and is a blur.
A buddy of mine just got jumped a few weeks ago by 3 guys. He said he didn't go out either but doesn't remember anything that happened, just that he kept getting up. lol