Panel (a): SDO/AIA 1600 Å image at 06:33 UT overlaid with QSLs in red contours at simulation time = 15. Panel (b): Twist distribution at z = 7 Mm at simulation time = 0. The positions of the eFR, wFR, and small arcades are marked. The dashed and solid black lines represent the twist = −0.5 and twist = 0.2 contours, respectively. The dashed orange line shows the slice location in Figs. 6a and 6b. Panel (c): log (Q) distribution at z = 0 at simulation time = 0, with high-Q regions highlighted in color. Blue lines mark the locations of the short tail-like ribbon and the head-like ribbon, while orange and green lines mark two S-shaped ribbons. Black rectangles denote the positions of four bends, which correspond to hooks observed in flare ribbons. Panel (d): log (Q) distribution at z = 7 Mm at simulation time = 0 with same markers as in panel b. The pixel size in panels b–d is dx/4 = dy/4 = 175 km, where dx = dy = 700 km is the spatial resolution of the simulation.