A five-year-old boy, Leo, is brought to the emergency department of a tertiary care hospital in Calgary by his parents. He presents with a two-day history of escalating fever, productive cough, and significant shortness of breath, now accompanied by central cyanosis and altered mental status. Physical examination reveals tachypnea (respiratory rate 45/min), tachycardia (heart rate 130 bpm), diffuse crackles on auscultation, and oxygen saturation of 82% on room air. Chest X-ray confirms extensive bilateral infiltrates consistent with severe bacterial pneumonia. The attending pediatrician determines that immediate intravenous antibiotic therapy, oxygen supplementation, and potentially intubation are critical to save Leo's life. However, Leo's parents, citing deeply held religious convictions that forbid conventional medical interventions and advocate for spiritual healing and specific herbal concoctions, firmly refuse all recommended treatments. They state they will only allow prayer and their traditional remedies. Despite extensive discussions explaining the grave prognosis without intervention, the parents remain resolute. What is the most appropriate next step for the healthcare team in this urgent situation?