Sawthe light
I don't want to trivialise this sad event, but surely the rider has failed to keep the horse under control.
A welsh cob is a powerfull horse and I would be very impressed if any jockey could control a startled one. Regardless of heli type either a gazelle or a chinook, one flying
It was virtually taking off the chimney pots
would be enough to startle any animal/person.
It was just unlucky that at the same time the heli flew overhead there were two cars on the same road and she hit them.