Glass:rofl He was stunned by the punch, walked backwards to gain composure and fully recovered within about 2 seconds. Guiterrez hits hard enough to knock lesser guys out with the same punch. Watch the fight and see how often Alfredo gets caught. Over and over and keeps walking. Now watch him against Tsurkan, a natural 154 pounder, with decent enough power. Angulo's crap defense presented the same problems which he shook off nicely. Your kidding yourself if you think his chin is glass mate.