On one of my flights last week I had an (white bellied sea- ?) eagle looking for my bird.
It is difficult to spot, since when they close, it is to late, but as soon they mirror the horizontal movement of my birds, from some heights above them, I switch to sport/racing and do the opposite, birds would do: I fly up and in the direction towards them. Till now, they mostly loose interest and fly away. Seems they don't like it, if a suppost prey can even get above them
Edit:
And that a "prey" can hover and fly backwards. I think, flying the drone on the spot in all 4 directions, at least for bird of preys, makes it a bit difficult for them, to decide from where to attack. Where is the tail?