I love how people make arguments that "MMA" or "BJJ" wont work on the streets because concrete hurts. DUH, it hurts BOTH people. I've rolled on concrete before when my stupid drunk friend tackled me. Is it a little more uncomfortable then rolling on a mat.. yes...does it become impossible? No..infact, I didn't real notice it at the time because of adrenaline but I had a few scrapes on my elbow and one of my knees. But other than that..everything else was the same.
You see, what your don't acknowledge is its uncomfortable to BOTH people. And In a real fight, I CAN USE THE CONCRETE to MY advantage.
The gay mma fighter was a perfect example of this. He mounted the guy and controlled him while he was punching him..and banged his head on the concrete..lol Yeah..BJJ is USELESS. I bet that fucker on the bottom getting his head smashed into the concrete was thinking "Man..I wish I knew some kung fu right now" lol