Play it. The seeded lesion of infected cells (■) grows across the healthy sheet (■) as the extracellular virus field diffuses and drives stochastic H→I transitions — and new infections land NEXT TO existing ones (locality ratio 0.61 < 0.75), not scattered uniformly. n_I grows 9→16 with population conserved. Base infection mechanism only — no IFN resistance or cell death yet.