Hi Noload
How are you trying to do this? Are you long range dueling where there is lots of movement and then trying to do the tactic? If so, it probably won't work in that context? There are three specific scenarios that come to mind where this will work:
1) From an interview structure where the bad guy is palming the knife against his right thigh while indexing you with his left hand.
2) From a CQC attack from him where he has his left forearm across your chest (maybe grabbing your shirt) and holding you off from moving straight in while stabbing you with his right hand.
3) From a fighting stance where your opponent has no movement- he is virtually a statue. Believe it or not, this is quite common, even with semi-trained guys.
Give it a try and see if this helps you. Remember, going up against a trained knife fighter is crazy, look for the escape first. If you are not successful look for the equalizer- bounce a garbage can off his face and then try your counter.
Out
Joe