Hymenoptera: Formicidae
Crematogaster sp
It isn't pretty.
A Light Fly (Pyrgotidae) attracted to our light is set upon Acrobat Ants.
Though the ants are a fraction of the size of the fly, they soon overpower it, stinging it and overpowering it by force of numbers.
Immediately, the fly is chewed into pieces and carted off to the nest bit by bit.