A 52-year-old male patient with a history of chronic alcoholism presents for elective laparoscopic cholecystectomy. During induction, the anesthesiologist plans to use sevoflurane for maintenance. Intraoperatively, the patient develops unexpected tachycardia (HR 120/min), hypertension (BP 160/95 mmHg), and muscle rigidity. The anesthesiologist suspects malignant hyperthermia and immediately discontinues sevoflurane. Core temperature at this point is 37.8°C. Which property of sevoflurane most likely contributed to the rapid onset of this clinical picture and why is its discontinuation immediately effective?