Short-term histories of BH magnetic flux Φ_BH during magnetic flux eruptions in the prograde a = 0.9 (red; time window from t₀ = 19 500M to 20 000M) and retrograde a = −0.9 (blue; time window from t₀ = 16 800M to 17 300M) cases. Two epochs of interest are indicated in the prograde case: the eruption onset at t = 19 594M and its advanced stage at t = 19 630M; one epoch is indicated in the retrograde case: the magnetic-flux peak at t = 17 050M.