@waylow The “Relationship Lines” are running from the “Control Points” of the “MCH_armSpline.L” curve to the origin of the “Armature” named “rig” since these points have “Hook Modifiers” which connect them to bones of the “rig”.

After having moved the “Root Bone” away from the “Armature’s” origin:

The “Hook Modifiers” on “MCH_armSpline.L” :
