Top row: Spatial distribution of the gas particles ejected by MBH feedback at z ∼ 8.77 (left-hand side) and immediately prior to the cavity opening, at z ∼ 8.39, (right-hand side). The distances of the particles from the MBH are shown in the inner circle, whereas the angular distribution histogram is reported in the outer ring. An angle of 0° corresponds to the z-axis orthogonal to the galactic disc. Bottom row: Histograms of the ejected particle angular distribution (as number of particles) immediately after the MBH feedback event (t₂ and t₂′) and after 5 Myr (t₃ and t₃′). Outflowing particles are shown in blue and red respectively, while infalling ones are identified with cyan and orange.