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Here's a Asilid that caught a Sarcophagid. Notice the larvae that appear from the victim. Apparently, either the muscles controling the birth are relaxed, or the predation causes pressure inside the fly that forces the larvae out. The latter seems unlikely since the robberfly sucks the prey dry - but note also the extended proboscis.

Which robberfly can this be? Switzerland, Mavaglia (Tessin) at ca 350 m altitude. It's inside the village, which is against a rather steep mountain side. In between the houses you find wine yards, vegetable gardens etc, as well as small patches of grass land.