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Hello,sir. When a JHP hits something "hard", the material through which it is passing not only plugs the hollow point, but tends to "hold" the slug together and in its original form ..... other than to flatten the nose a bit. In "soft targets," pressure builds from the fluid's entering the hollow point and building pressure; there's also nothing to retard the slug's mushrooming out. The bullets do not deform until striking their (soft) target and most of the expansion will occur during the first inch or two of penetration as that's when the bullet's velocity is highest. Obviously, it slows and expansion decreases as it passes through any medium. Best and good shooting.
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