Evolution along the representative trajectories associated with Figure 1. For M_s ≃ 1 (left) and M_s ≃ 10 (right), the panels show δB/〈B〉, the pitch-angle cosine μ, and the normalized first adiabatic invariant (1 − μ²)〈B〉/B as functions of tΩ. Red, blue, and green denote decoupled, intermediate, and strongly coupled runs. Approximate conservation of (1 − μ²)〈B〉/B indicates adiabatic mirror motion, whereas abrupt changes indicate nonadiabatic pitch-angle scattering.