He had an overhook and tried to bend the elbow up and against the joint. He did it twice in the Chattanooga clip, you can see the Chattanooga wrestler shaking his arm out after the first time when the ref couldn't really see it and then he does it again and the match is stopped and the Chattanooga wrestler is awarded a penalty point. But Fernandes actually won this match 6-2.
It doesn't appear any prior penalty points were awarded in the SDSU clip. But right in the beginning he appears to try to twist his fingers, then also of course the multitude of slaps to the head, the most egregious of which I thought was right after the restart after the ref was talking to them. Technically, I'm not sure if he was DQ'ed right away for the elbow thing. It appears as if he was penalized for an illegal move which resulted in an injury to Cook who did not continue, thus ultimately resulting in the DQ.