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I am puzzled by this behavior. Did this fly catch the insect or did it maybe pick up an already dead insect? I thought only Robber flies catch live prey? Can someone perhaps explain what is happening here? Do you also perhaps know what fly (small in size) this is and what the other insect is? Any help will be appreciated.:)

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Another angle.

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it seems Coenosiinae (Muscidae)and the prey Sciaridae; also Empididae aer predators, nice pics :)

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Coenosia sp. preying a sciarid... Coenosiinae, in general, are predators.

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This fly is Coenosia strigipes (Muscidae). Conosia are predator flies, catching other littles flying insects. See this article. There are also others familes of predator flies like Empididae, Hybotidae, Scathophagidae...

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Thank you Paqui, Jorge and Stephane. This is very intersting information. First time I've seen this.:) Jorge, I'm still looking for Mythicos. Seems we will have to wait untill later in the year.:)

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Stephane, thank you for the link to the great article. I love the fact that the flies will climb on a hand and then return with prey.:)

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Thanks, Vida. Pay attention to them. They appear in hot and dry climates near Asteraceae/Euphorbiaceae flowers (dunes are a good point to find them, and any place rich in flowers and protected from the wind). Don't forget the nemestrinids as well.