How does Profis handle a shear force that is rotational in the plane of the plate?

When a load is applied that would cause the plate/anchor group to experience a rotational force in the plane of the plate Profis appears to calculate forces in x and y on each anchor in both positive and negative directions. It then seems to check only one of the directions with a load in that direction. I would like to understand what it is doing and why it isn't checking anything in the other direction.