Hi Emanuel,
                 this question raises its head regularly.... 
 http://www.vikingsword.com/vb/showth...ighlight=gatka
http://www.vikingsword.com/vb/showth...ighlight=gatka
 
http://www.vikingsword.com/vb/showth...ighlight=gatka
http://www.vikingsword.com/vb/showth...ighlight=gatka
   There seems to be 'two camps' .....those that agree about the techniques of Tulwar use ......and those that do not.
     Personally I totally agree that the Tulwar 'became' an 'extension' of the arm /torso and sweeping cuts would be the norm. Wrist control is almost impossible so delicate movements would, similarly,  be almost impossible.