2 Hand XR Grab Interactable for Sword - Expert advice needed

I have a 2 hand XR Grab implemented that works for a rifle with no issues. Here is the key code section:

 // Get the direction of the first hand relative to the second hand
 var directionOfHands = secondInteractor.GetAttachTransform(this).position - firstInteractor.GetAttachTransform(this).position;
 
 // Set the forward facing attach transform to point in that direction
 firstInteractor.GetAttachTransform(this).rotation = Quaternion.LookRotation(directionOfHands);

However, I have been trying to edit the code to deal with a 2 hand long sword and it doesnt work since the hands are placed above each other in that case. Anyone know how I might edit the code to allow for a 2 handed long sword?