The Right Forearm always Traces -- points at -- one of the three selected Delivery Lines (2-J-3):
1. The True Geometric Plane Line (usually the Target Line);
2. The Arc of Approach;
3. The Angle of Approach.
The Clubhead may Trace -- point at -- the True Geometric Plane Line and simultaneously cover the Arc of Approach. Alternatively, the Clubhead may simply cover -- not Trace -- the Angle of Approach.
If you trace the Arc of approach, would'nt that bend the plane line?