I would say, from the position of the two aircraft that there is no way that the B-17G could be responsible for that. The Lancaster has run up the B-17s right wing. The B-17s right wing is between the Lancaster's landing gear.
No way the 17 coulda done that.
Lanc was the one in motion.
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We few, we happy few, we band of brothers;
For he to-day that sheds his blood with me
Shall be my brother
Sisu
-Karnak