Same as Figure 17, but focusing on the interval ﹩t=0.70\,\unicode{x02013}\,0.77\,{{\rm{\Omega }}}_{{\rm{KH}}}^{-1}﹩. Panel (a) additionally displays the time evolution of ﹩{U}_{\phi }^{{\rm{V}}}﹩, which represents the toroidal magnetic energy in the twisted magnetosphere at r > 0.06 r_H. Purple shadings in panels (a)–(c) mark the active periods of the “pinch” mechanism (see the main text for details).