The 2-1-1 ability appears to be called "Knife Hand Chop" or something similar. It puts some kind of stacking effect on the enemy, but I have no idea what it does.
Also, contrary to the information in the guide, the 2-1-2 martial arts attack "snap kick" doesn't appear to be an exploit attack. I've tried using it against exposed enemies multiple times and not gotten any extra effect out of it. On the other hand, 1-2-2 "spin kick" appears to be an exploit attack, albeit not as damaging as the 1-1-2 "haymaker."