Left panel: minimum approach of a ray to the BH vs. delay time from the first detected pulse, as seen on the BH equator (θ = π/2). Color scheme is the same as in Figure 7. Black/red points: prograde/retrograde rays; blue/cyan/green/gold points denote rays reaching ﹩| \cos \theta | \gt 0.1﹩. Horizontal dotted lines mark the prograde and retrograde photon orbits, here for a/M = 0.5. Right panel: winding angle of the ray around the BH. Rays that closely approach one of the light rings experience a single radial bounce (dr/dλ = 0).