Welcome to the Squadron old bean. It just gets curiouser and curiouser as The Von's combat report for his 15th victim on Dec 27 1916 reads:-
At 1615, five planes of our Staffel attacked enemy Squadron south of Arras. The enemy approached our lines but were thrown back. After some fighting I managed to attack a very courageously flown Vickers two-seater. After 300 shots, the enemy plane began dropping, uncontrolled. I pursued the plane up to 1,000 metres above the ground. Enemy plane crashed to ground on enemy side, one kilometre behind trenches near Ficheux.
Weather: Mist in the morning, clearing later.
According to Under the Guns of the Red Baron
there are no records of an FE2b two seater being lost that day behind the lines at Arras or anywhere else for that matter! You will enjoy the book as it's very informative, the illustrations are superb.