At t ≈ 4M (in geometrized units) after the time snapshot in Fig. 3, the outgoing severed flux tube segment has been magneto-centrifugally slung out to large distances. The ingoing portion of the severed flux tube has contracted toward the event horizon. The particular case has a∕M = 0.9 and the top boundary of the severed flux tube is at r = 1.08r₊. The compact size suggests replacing the azimuthal surface current source of B^P in Eqs. (21) and (22) with small azimuthal current rings. This configuration defines the calculation that produces the field line plot in the top frame of Fig. C.2.