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I know too little about Afrotropical Asilidae, so I can't give you the species name. It seems that they belong to the subfamily Brachyrhopalinae but I can't see enough, so it is just a guess. This kind of behaviour is also known from the genera Dioctria (Dioctriinae) and Holopogon (Brachyrhopalinae). You can find more here: https://sites.google.com/site/australianasilidae/introduction-2/biology/adults/courtship-and-mating