Spatial organisation of force densities in the magnetised multi-wavelength simulations at a fixed non-linear stage Δh/L_x ≃ 0.35. Top row: magnitude of the Lorentz force acting on the charged fluid, $|{\mathbf{f}}_L|=|(\mathrm{\nabla }\times \mathbf{B})\times \mathbf{B}|/4\pi$, with magnetic field lines overlaid. Bottom row: magnitude of the ion-neutral drag force, |R_n | = αρ_cρ_n |v_c - v_n|, with streamlines of the relative velocity Δv = v_c - v_n. The white contours delineate the mixing layer. From left to right, the coupling strength increases while the spatial window and colour scales are kept identical within each row. Both forces are expressed in cgs units (dyn cm⁻³).