The assertion that the human ear, particularly the part struck by a bullet, is "mostly solid" and therefore immune to cavitation damage is inaccurate. While the outer ear (auricle or pinna) is composed of skin and cartilage, which are indeed solid tissues, the internal structures of the ear, including the middle and inner ear, contain fluid-filled spaces. The middle ear contains air, but the inner ear houses the cochlea and vestibular system, which are filled with perilymph and endolymph, both liquids. A bullet passing through or near these fluid-filled cavities could induce cavitation, leading to significant tissue damage. Ballistic gel, being primarily water, is an effective medium for demonstrating cavitation effects due to its liquid composition, and the damage observed in such experiments, even if the ear is not "ripped off," can still be severe and catastrophic to the delicate structures within the ear.