A 22-year-old unrestrained front-seat passenger is thrown against the windshield in a high-speed rollover motor vehicle collision. He arrives at the ED deeply comatose (GCS 4), with decerebrate posturing and bilateral extensor plantars. Non-contrast CT head shows no skull fracture or mass effect. However, multiple subtle petechial hyperdense foci are identified at the **grey-white matter junction** (marked **A** in the diagram), within the corpus callosum, and at the dorsolateral midbrain. Subsequent MRI with susceptibility-weighted imaging reveals innumerable microhemorrhages in these same distributions. Which of the following best explains the mechanism of injury responsible for the petechial hemorrhages marked **A**?
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