Properties of the outflow feedback cavity for the m _BH = 10M _⊙, s = 0.5 case. The left panel shows a comparison between the BH accretion timescale and the shell breakout timescale ﹩{t}_{\mathrm{acc}}/{t}_{\mathrm{bre}}﹩, with ﹩{t}_{\mathrm{acc}}\gg {t}_{\mathrm{bre}}﹩ over wide parameter regions. The middle panel shows a comparison of density between the cavity and the initial environment ρ _cav/ρ _CO, indicating that the gas density surrounding the BH is significantly reduced. The right panel shows the size of the cavity r _cav/r _rel, which is much larger than the BHL and Hill radius of the BH; and shows the trapping radius ﹩{r}_{\mathrm{tr},\mathrm{cav}}/{r}_{\mathrm{obd}}﹩ of the circum-BH disk accreting the cavity gas by contour lines, ﹩{r}_{\mathrm{tr},\mathrm{cav}}\ll {r}_{\mathrm{obd}}﹩ implies a significant reduction of BH mass accretion rate in the low-density cavity.