Magnetic field lines disconnected from BH horizon within r ≤ 6M at a less advanced stage of magnetic flux eruption (t = 19 630M) in the prograde a = 0.9 case. Upper panel: Lines colored by magnetization parameter σ = b²/w; lower panel: lines colored by radial velocity v^r. A sample of doubly connected lines seeded at r₀ = 1.42M (just under the horizon) are shown colored in white (upper panel) or yellow (lower panel). The magenta patches mark regions of relativistic temperature (log₁₀T ≥ 0.5). The view point is at θ_obs = 45°, ϕ_obs = 180°. Black sphere indicates the outer horizon at r_H = 1.436M. The grid of black arcs marks the radii r/M = 2, 3, 4, 5, 6 in the equatorial plane θ = 90°, and in the ϕ = 210° quadrant spanning the latitudes θ_L3, min ≤ θ ≤ θ_L3, max. An associated movie is available online.