Ω_p in a v5 retrograde model (MAD, a_* = −0.5, i = 30^∘, R_high = 160) as a function of different emission masks. Left: we only include emission within Δθ_jet of the z (jet) axis. Right: we only include emission within Δθ_disk of the midplane. When Δθ_jet = Δθ_disk = 90^∘, we plot the mean Ω_p from all emission. Black hole diagrams in the top-left and bottom-right corners illustrate Δθ_jet and Δθ_disk. As Δθ_jet decreases, we filter for jet emission only and, thus, see counterrotation (Ω_p < 0 for i = 30^∘). Jet counterrotation is a fundamental prediction of the Blandford–Znajek jet-launching mechanism when a_* < 0.