Anna Rowe

If one was knocked down by a runaway police horse, one would have an actionable case against the police.

Thanks for that. I assumed that everyone has a duty of care at all times towards everyone and everything.

Not always but that case clarified that when police are enforcing the law they DO owe a duty to others - The person trampled by the horse will be entitled to damages

Which in reality should then be recouped from the brainless idiot that threw the firework.

Indeed but it was foreseeable that a horse can get 'spooked' and can react unpredictably even if trained to overcome their natural fears - eg Police dogs often bite the wrong person - usually just the person who gets too close to their jaws - I should know I was bitten in 1994

Were the horses not involved in a charge, when the rider hit her head, at speed, on a traffic light, and was forcefully knocked off?