Ratio between radiation and gravity acceleration in the r direction, averaged over π/2 − 0.24 ≤ θ π/2 + 0.24 near the θ = π/2 plane. The blue solid lines indicate radii 30r _s and 40r _s. Due to the radiation pressure near the collision site, the r-direction radiation force exceeds gravity in the downstream gas, creating a local super-Eddington region that extends a few r _s from the collision.