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I photographed these robber flies in a courtship display in Kruger National Park, South Africa in September. Kindly ID them for me, and if anyone has further info on courtship in robber flies I would appreciate it, as I have never seen this before. Thanks!

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Here is a second photo taken from the side, if it helps with the ID. Thank you, all info. much appreciated.

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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

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Thank you so much Reinoud, really appreciate you taking the time to point me in the right direction. Will read the article and proceed from there.