a)−h) Eight snapshots of the SXR images during the weak-flash phase of the CBP. PA and PB stand for patch A and patch B of the CBP. “Arc 1” signifies the magnetic loop connecting the CBP with the remote leg (RL). BG denotes the background region used for the calculation of light curves in Fig. 3. The solid white line denoted with cut1 in panel d) is used for studying the transverse drift of “Arc 1”. An animation of this figure is available online.