Left column: evolution of the distance between the central and the satellite BH in Event 1 (top), Event 2 (central), Event 3 (bottom). The dashed green line displays the evolution using the dynamical mass scheme (DYNMASS), the blue solid line is for the DF scheme (DYNFRIC), the dash-dotted red line for the repositioning (REPOS), and the densely dashed orange line is for the case without any sub-resolution prescription (NOCORR). The horizontal grey solid line represents the distance threshold which is necessary for the merger event d_merg to happen. Right column: evolution of the distance between the BHs for the DYNFRIC case (top panel) and ratio between the DF and gravitational forces during each event.