To respect Delirium's request I haven't looked at the file. But I think I know what's happened in the film.
I'm betting you pulled the stick hard dodge bullets, and kicked the rudder hard at the same time.. which swung your Spitfire 180 degrees and made it enter a flat spin.
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In that case, try turn off the engine - that usually enables the plane to get out of the flat spin, and regress into a normal spin .. which then, you can pull out of.