Multi-Observer Visceral Contention in an Unencumbered Room: Per-observer spatial partitioning versus global mean and min-max autonomic damping, with active pre-cancellation of the crosstalk

When an unencumbered room is the shared encoder for two standing observers, a scene-damping gain that reconciles an interocular step for one observer is an unrequested kinematic drive on the other. This paper extends the single-observer ordinary-differential-equation plant of the parent deposit (doi:10.5281/zenodo.23479465) to two observers integrated at 0.1 s from t = 0 to t = 720 s. Observer A, seed 42, half-saturation 3.5 ms, receives a unit conflict on (420 s, 660 s]. Observer B, seed 1042, half-saturation 4.5 ms, has conflict 0 throughout. Five regimes share those noise draws: open loop, global mean, global min-max, per-observer spatial partitioning with crosstalk 0.12, and active pre-cancellation of that crosstalk. Open-loop A reproduces the parent rows. Its simulated perfusion reaches 0 at 511.8 s. Open-loop B remains at perfusion 1. Under the mean, B's minimum is 0.446 at 664.6 s and A's minimum is 0.856 at 711.2 s. Under min-max, the step holds A at 2.340 ms and B at 6.120 ms; B's minimum is 0.379 at 665.2 s, and A's minimum is 0.692 at 720.0 s. Spatial partitioning keeps both minima at or above 0.70: 0.931 for A at 670.1 s, and 1.000 for B. During the step that regime holds A at 3.079 ms and 0.0585 Hz, and B at 2.054 ms and 0.0507 Hz. Active pre-cancellation also keeps both minima at or above 0.70 inside the window. A's minimum is 0.721 at 720.0 s, and B stays at 1.000. During the step, A matches the spatial hold and B stays at the open-loop baseline, with delivered gains 0.774 and 0. At 720 s, A is at 4.875 ms, HF = 0.497, and 0.0741 Hz. These quantities describe the plant and the five arbitration laws.