No I mean A weav of air that sort of fastens the whole handle to his one hand, it would kinda make it ilitylike his hand was bigger. It would increas his stablility, trust me Ive held a sword you dont wanna swing those things with one hand, unless you can cover the whole handle, it kinda sways.

 

P.S. Just to stop any jokes from a happening I dont use a sword it was more of something to buy cause it looks cool  ;D I use the bow and gun instead :)

It might have to do with balance as well - swords are balanced when they are made.  Perhaps Rand needed both hands to maintain that balance, so he'll have to figure out how to do so with only one hand.

 

Or perhaps Lord Voldemort could fasten a magical hand on him the way he did with...oh wait...that was another movie.