Seems to Me that a Handheld Tazer touched to those horses around the genitalia/rectum especially would probably cause them to rear up. That’ll tell the tale of whether or not if those are just riders or real horsemen...
An old Communist technique was to stub out a lit cigarette on the rear of a horse, causing the horse to jump and sometimes throw the rider. It also made for visuals that showed the police to be Cossack like in their suppression of riots and demonstrations.
Touch them with an electric prod *anywhere*, and they’re throw the rider, but I’d rather just give them a very w-i-d-e- berth. No sense in hurting the animal.
even before you let go of the button...