A 3-year-old unvaccinated child presents to the emergency department with sudden onset high fever (39.5°C), drooling, dysphagia, and a muffled "hot potato" voice. The child is sitting upright, leaning forward with neck extended. A lateral neck X-ray is obtained (after ensuring airway stability). The structure marked **A** in the diagram shows marked swelling, appearing like a thumb in the airway instead of the normal thin curved appearance. Which of the following is the MOST appropriate IMMEDIATE management step?
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