By Alek Arend An insane knockout is going viral at UFC London on Saturday. Molly McCann (12-4 MMA, 5-3 UFC) used a spinning elbow to defeat Luana Carolina (8-3 MMA, 3-2 UFC) by knockout on Saturday afternoon. The insane move is being called the “knockout of the year” on social media as we speak. Warning: the following video may be considered disturbing to some viewers. Take a look. You could make the argument that’s one of the most impressive knockouts of all-time. Molly McCann deserves the recognition she’s currently receiving. McCann revealed after the match that the spinning elbow is a move…