On awakening after orthopaedic surgery, a healthy 34 y/o male patient is suspected of biting his endotracheal tube for 5-10 seconds. Bloody froth is observed within seconds of the apparent bite. Pulmonary edema sets in. Question #1: Can a 5-10 second bite on an 8.0 endotracheal tube trigger NPPE? Question #2: Is the immediate appearance of a bloody froth consistent (or possible) with NPPE given the supposed obstruction from the suspected bite? Question #3: Was this really a NPPE?