I think that scratching somebody's face in is a working move in fighting. I theorised what you can actually do with it. -you can make opponent close eyes, this goes for slapping as well = tactical benefit and windows for more powerful strikes/techniques without risk of missing -if they don't close eyes = blindness ensured for complete control -it really really hurts, and you are not passing it off with adrenaline = pain reaction garuanteed -if opponent grabs wrist in attempt to stop scratching = elbow to face. Remember that post? -extra three inches to attack reach -open wounds = biological warfare: enjoy infections Seriously though, scratching is viable as supplementary techniques in a fight. I respect tiger claw kung fu a lot more now.