Re: Battle of Britain - Air Superiority: Nerd Herd Group Build
I think Jeep answered most everything...
I think just from that crash the rudder/flaps would have been moved in any position. 
Kill it as in exploding? I don't think a plane exploding into pieces was common back then. Mostly when a plane got shot up enough it the pilot looses control and starts a dive. This can happen from what Jeep says; Engine, Pilot, Controls get hit but other factors can be a shredded tail or wing or rudders and flaps from machine gun fire. Also something that's commonly seen is since the fuel tank sits between the cockpit and engine, it can get hit and rupture and catch on fire in turn causing a ton of smoke and fire getting pushed into the cockpit, choking/burning the pilot.
Not an expert mind you. I learn most of this stuff from hours on end playing "Red Baron" back in the days. LOL
They didn't have feathering capabilities in WWI that I know of. This was produced in planes right before WWII (correct me if I'm wrong). Feathering is the ability to rotate the props parallel to the air flow to reduce rag. This is done when the engine goes out so the pilot can glide further.
But if the Spitfire had the capability in WWI and a pilot is shot down and tried to land for a save, then I would assume the pilot would feather the props.
What Jeep said. It was for D-Day so that allied forces can identify them better and reduce friendly fire incidents.
DK