it doesn't have to be a flash reflection, camera lenses are highly reflective so any source of light can cause this kind of "orb"

i think that its the horses ghost

I see a wierd figure in the horses chest.

This is an true orb.

As flash reflections are commonly quoted as causing orbs, I'd like to hear what any "orb debunking experts" have as an explanation of this :)

Watch out for that sniper behind you. He's trying to kill the horse.

aye well it is edinburgh after all who kens what goes on there, it being the most haunted place in scotland after all! but i think probably dust, its gie windy up there!