This is a mess, and very interesting!
As I see it, the mating pair were busy, the wind totally messed up the zebra, and the lioness went for supper. Typically, the male was more interested in mating but made a token effort there at the end of the kill...
They have to eat eventually!
Then the sounds alerted the rest of the pride, so the dominant male and the dominant females acted instinctively to restore order so to speak? The main male won't tolerate other males unless in a coalition, at mating.
I'm not so sure that this was the actual moment the youngsters were chased away?
It is the same pride, otherwise they would all have gone for the couple, no questions asked.