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"Dolly Fly" strange behaviour. (1 of 3)

Can anyone explain what is happening with this "Dolly Fly" please? I can't imagine it is trying to eat a worm, so is the worm trying to enter or exit the fly? I watched it for several minutes, but due to storm Hector, I wasn't able to follow it to conclusion. I think the fly is female, there was a male in attendance and he was quite animated, flashing his signal feet.

 

Edit - Update. Info from replies to my Facebook post and flickrs rockwolf, seems that this fly is predatory and is in fact, eating the worm.

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Uploaded on June 18, 2018
Taken on June 14, 2018