Perhaps both sides in the Hunt/No-Hunt camps will take note of the loss of a life and come to their senses otherwise this will not be the last person killed or maimed as a result of gross stupidity on both sides.
One would hope that would be the case - sadly, I fear not - particularly when an AR activist on another site posted: "the tactic of scaring a horse so it will throw the rider is I believe legitamate, but I would never purposefuly hurt them."
Gathering evidence by use of any aerial or ground platform is perfectly legal. That the subject(s) being filmed won't like it, is another matter.
Try going to your local park and filming young children at play and see how long it is before a policeman turns up to arrest you. These so-called monitors are constantly filming children out hunting (and screaming foul-mouthed abuse at them!) Funnily enough, their parents DON'T like it!