I am wondering how many of the people who complains about scenes like these been in a real fight? Do they know what one unlucky hit can do, which is why ambushes or surprise attacks are so dangerous? Not specificly talking about this scene or the person you replied but generally talking about whole concept. Kinda interesting tbh. 

		 
		
	 
	
		
	
	
		
		
			I think they haven't been in a real fight ever. Unfortunately, I've been, and not always on the winning side. I know very well what a sucker punch can do.
		
		
	 
Part of the job. A nice one, if you wish to live on a constant adrenaline rush, at least until you realize after that that one fight a single mistake was the difference between life and death by having but a bit of long pointy sheet metal, commonly known as hunting knife, between your ribs. Because, no matter how great is your experience and how long you are training, it ain't making you bullet or blade proof, but surely increases your chances of survival.
Real fight ain't pretty, ain't clean, ain't hollywood prefectly choreographed exchange of perfectly timed and aimed hits. And you don't really know if the ones you are fighting aren't armed with something more than thier experience and fists, or on drugs which can, for example, numb him well enough to not feel even a kick to the head.
My only complain about that scene would be about MC not defending himself after that knockdown, but just sitting there peacefuly taking more hits. I don't think it would change the outcome that much, but I expected a bit more from someone knowing "crab-maga".