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Thank you very much Theo,
You can go on with your life in peace, I don't take out weapons!
Unfortunately I don't have any other pictures. It left too quickly!
I have already photographed a Miltogramma that was closely following an albisecta megachile making its nest (It did not succeed in its task...).
It is true that these little cleptoparasite flies are very similar...
I read that Amobia are kleptoparasites of Ancistrocerus. If that's right and I see it near an Ancistrocerus nest, it would be a safer identification.