Yes NJG2 flew in the area from Düsseldorf going north all the way to Denmark. Since you noted Rökker, I took his chronic and noted that the Möckel crew was lost at Esjberg due to friendly flak. I doubt it was the same operation but , stil this loss has to be taken into account:
Ju-88 G1 3/NJG2 werk: 710610 Ff: Möckel Bf: Lehne Bm:Schröder.
The crew is buried in Esjberg. NJG2 was based at Kassel Rothwesten which seems fair to fly to Düsseldorf, but the Esjberg presence makes me think of a Wilde Sau refuelling or something. The fact that it was shot down by own flak shows the Germans did not expect this aircraft and it was possibly lost. Do you know if the weather conditions were foggy?

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