Should the BE. experience even the lightest crash, the gunner was guaranteed to be crushed by the firing V8 engine mounted to his back. It honestly didn't matter, however, since the gunner was much more likely to be sucked into the whirling propeller blades like a Bond villain long before then.
Because there was no shielding used whatsoever between the gunner and the roaring vortex of death behind him, anything loose on his person, be it a scarf, wallet or goddamn arm while swinging the gun, was instantly sucked into the propeller blades. The gunner had no choice but to literally hold on for dear life until he either tired out or landed. And because the screaming engine was placed between the helpless gunner and the plane's oblivious pilot, the gunner had no way to communicate his fatigue to the pilot until the spray of his guts hit him in the face.