... or a novice so-called pilot trying to do a barrel roll at low altitude with a heavy twin-turboprop airliner?
From the film I have seen, he was apparently able to pull off a nose high aileron roll, which is NOT a barrel roll, though the two are often confused, especially in an airplane with a relatively low roll rate. Aileron rolls in such a plane wind up nose low at the end unless they are started with high enough nose high attitude to prevent it from "scooping out" at the bottom without stalling during the maneuver. A true barrel roll hits specific combinations of heading and nose attitude changes throughout the maneuver.