In 45 seconds it came and went. Ballast from atop the roof rained down, shattering windows, sending glass shards flying. Wind peeled back the underlying deck. In it rushed, ripping doors from hinges, Sheetrock from studs, IVs from patients' arms. Up it barreled, blowing out ceiling tiles, light fixtures, wiring. On the roof, an air-handler lifted off, then slammed into a back-up generator. The building lost power. Patients on respirators lost their lives.