Thanks so much for the nine-minute video. I learned a lot.
Is the male attacking his own chicks?!
And: although your paddock is of a good size, it's interesting for me to compare the dynamic with that of the tame-wild birds here.
Thirty, forty, fifty yards is point blank in respect of contending emus. The head-down-lock-eyes-charge behaviour is sooo recognisable. And it's as though once the locked-eyes thing has happened, humans become invisible to them.
I never fail to marvel at the absurd amounts of energy the dominant ones will put into rushing over to attack lesser birds.
And chicks that have for some reason no Dad to look after them will latch onto random adults emu, even if they get repeatedly chased away. I had to dig this photo out: