Cartoons schematising the magnetic topologies derived from potential field extrapolations for co-occurring QSEBs and UV brightenings. Panel (a) shows a dipole configuration with a black vertical line marking the polarity inversion line (PIL). Panels (b), (c), and (d) depict UV brightenings occurring at the null point of a fan-spine topology. These three panels highlight various possible locations for QSEBs: near the footpoint of the outer spine (b), near the footpoint of the inner spine (c), and near the dome footpoints (d). The orange-shaded parts highlight the possible regions influenced by the energy flow from the reconnection site.