In a, at a fixed central stellar mass of ~logMcen = 10.5M☉, the modulation in the fraction of quiescent satellites in TNG100 is shown for star-forming (blue) and quiescent (orange) central galaxies. Although there are a limited number of satellites, the modulation in the signal appears to be stronger for quiescent central galaxies than for star-forming ones. Since quiescentness in IllustrisTNG is a strong indication of an effective black hole feedback, the fact that the signal is stronger for quiescent galaxies is also an indication of the proposed AGN-related origin for the observed quenching directionality. The modulation in the fraction of quiescent satellites is shown for star-forming (blue) and quiescent (orange) central galaxies in b but this time for SDSS galaxies, again of logMcen = 10.5M☉. The observed modulation is stronger for quiescent than for star-forming central galaxies as seen in IllustrisTNG. Solid lines and shaded areas indicate the best-fitting trends and 1σ confidence interval, respectively. Error bars represent the best-fitting standard deviation, as described in the Methods.