Is there a picture or video on youtube that shows what you mean by 'jut sau'? Or are you saying there is jut sau in the clip you already provided? If so, please give a timestamp for when it happens, because I only see lap sau happening there, because I am still not sure what 'tehcnique' you are referring to.
Regardless of technique - From a mechanics POV, in HFY we never 'commit' to anything by using a 'grab'. We may guide, tug, pull, etc using the striking point, palm, outside knife edge, outside fingers (ring/pinky), etc with the correct leverage. But in most cases to grab as shown in the first clip using fingers and wrapped thumb is a big no-no! It is far too commited, tends to roll the elbow out of position losing structural integrity, gives up fwd intent, as well as allowing the opponent a chance to roll the arm over (And again. never pulling into our own space is shown in the clip - but again, that is lap sau).
Our SNT has ngnoi 'jut sau'. Can see the double hand jut saus at 1:31 and 1:37 in the following clip:
http://www.youtube.com/watch?v=nE84n...feature=relmfu
Is this what you are meaning when you say jut sau?