Temporal evolution of (a) the spatially averaged absolute velocity components ⟨|v_x(t)|⟩, ⟨|v_y(t)|⟩, ⟨|v_z(t)|⟩ and the ratio of free (E_f) to potential (E_pot) energy (dashed magenta curve). The shaded region between t = 5.44 and 7 min (shown by two vertical dashed lines) represents the dynamical semi-equilibrium phase of the system, where ⟨|v_y(t)|⟩≈19 km s⁻¹, ⟨|v_x(t)|⟩≈2.2 km s⁻¹, ⟨|v_z(t)|⟩≈5.4 km s⁻¹, and E_f/E_pot ≈ 2.1; and (b) the spatial average, $\alpha =⟨\frac{|\mathit{J}\times \mathit{B}|}{|\mathit{J}||\mathit{B}|}⟩$.