Kind of makes me think what came first the chicken or the egg? Since I can't see what you look like, it is conceivably possible you collapsed from some sort of vascular event or some such thing, and then hit your head on what you fell on. I doubt it, but... Get checked out. My medical license won't get here till tomorrow. I'll pray for you.
Tend to agree, any random criminal knocking someone out surely would have swiped the detector and checked pockets for $$.
If it wasn't a random criminal and someone did it out of spite for whatever reason, all the more reason to take the high tech gadget. But who knows, could be they knocked you out then got spooked by something and ran ,,, But, no one came to help you, called the police, nothing.
I'm guessing this was in an area with no chance of surveillance cams ? Very strange, sorry it happened.
I grew up a fighter starting from grade school and continued well into adulthood, probably 100's of fights/altercations. Many in my teens fueled by drugs/alcohol, used to even fight trees and stop signs [lost all of those inanimate object encounters] Only been knocked out clean twice, many, many concussions. I once took such a shot to the head that my vision turned sideways and there was a line of pure, bright electricity down the middle. Hobbled home and went straight to bed, worse thing I could have done, don't see how I didn't die. Woke up hours later choking on vomit, my mom heard me and rushed me to the hospital where I was diagnosed with a severe concussion.
You are lucky you didn't swallow your tongue and die, almost happened to me when I was knocked out, someone [assistant principal] stuck a comb down my throat and saved me, or so I was told.
A few years later I knocked out a guy in a fight, he started going into convulsions and I knew what to do - Stuck a comb down his throat, didn't like the guy obviously but I didn't want to kill him.