Brumby girls run around, great display of herd leader pushing the filly where she wants her

The brumby girls started running around when we were driving up the road. We're not sure what triggered it, maybe the other horses reacted, maybe it was their own reaction.
By the time I was close enough to film, I only caught one loop of their antics.
They have a great display of strength and speed, then Halo (the herd leader - palomino) keeps Ava at the gate with the rest of the herd in the next paddock. Safety in numbers. It's interesting, Ava went to break away for another run around the paddock and Halo stops her. It may be hard to see unless you're on a big screen as this part is at a distance.
Arthur is still thin. We're fencing off another paddock tomorrow with a glut of pasture and I'm back to the feed store tomorrow to top up supplies. We go through many bags of horse feed per week on Arthur, Penny and Cleo. None of the others need any feed at the moment, in winter they may need some extra.