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This wave was observed to continue propagating forward while its lower portion (labelled A in figure 13) remained with the shear layer. This is expected based on the fluid inertia concept where the wave has a tendency to continue propagating along its initial motion path during deceleration. Great differences in fluid velocity near the supersonic expansion region compared to further outward in the far-field can influence relative wave speed for the modified-terminating shock causing the wave's portion near the model to propagate at a slower speed. Figure 13(b) right column shows the outer portion of the modified-terminating shock in contact with the supersonic expansion region whereas at a later instance figure 13(c) right column, this wave has propagated away from the supersonic region. The compression waves present ahead of the projectile for AR=2 is the outer extremity of the modified-terminating shock.