worldSegment trimmed every line and capsule at cameraPin — eighty units, ten times the plane faces are cut at — on the stated grounds that 'nothing in the arena passes within eighty units of the lens'. The death cinematic drives the camera down to the ground, so plenty does, and each limb and blade of grass that got there was dropped whole rather than trimmed. That is the hollowed-out front of the frame on the end zoom. The pin was doing real work: a line is handed to the host with no band to catch it, so cutting at the plane alone would let one crossing it rake the width of the guard band. So the segment now gets the band a face gets, Liang-Barsky over the projected endpoints, carrying depth along t so a capsule still knows how far away its ends are.