Electron dynamics as a function of time (KE_ini = 2 eV, θ_ini = 45°). a) The trajectories of four particles in the global separator field, with orbs indicating the starting position (green), final position (red) and any locations where the particles mirror (blue trapezoids); the (thick black) trajectories are overlaid onto local magnetic field lines (grey), with arrows indicating the field orientation. To add context, we also include the nulls and their associated fans and spines, coloured for direct comparison with Fig. 1. b) The change in kinetic energy (black) and parallel electric field (red) experienced by each particle. c) A comparison of the (self-normalised) parallel velocity (black) and magnetic field (blue). The initial positions studied here are recorded in Table 1.