A 52-year-old man with a history of rheumatoid arthritis and ankylosing spondylitis presents for emergency laparotomy following perforation of a duodenal ulcer. On airway assessment, he has a Mallampati score of IV, limited neck extension due to cervical fusion, and a thyromental distance of 5 cm. Induction is initiated with propofol and succinylcholine. After loss of consciousness, bag-mask ventilation is found to be inadequate, and the first intubation attempt by the senior resident fails. What is the most appropriate next step?