A story. We had one of the water obstacles at an FEI 3*, a technical fence which involved three elements: a jumping effort into the pond, a second effort set in the water and the final effort as a step out of the pond, the whole complex on a curving line. Not a “designated stopping fence” and never ever likely to be one. With no prior warning, over the radio we were ordered to “Stop the next horse. Right now!”. We did as required and stopped the pair while they were still in the water, between elements two and three, one of our little team vigorously waving her red flag and shouting “STOP!” while standing on the step. The opinion of the German Olympic rider was expressed strongly and spontaneously as he could not believe he had been stopped in the middle of a water complex.
Just a short distance beyond our fence, hidden from sight by the terrain, an official’s car had managed to strike into a horse running on the course where neither had expected the other to be. This had been reported over the Officials radio net, not the Fence Judge one, so we were unaware of the problem which was maybe some thirty strides beyond our fence, invisible in a hollow.
The rider circled his horse in the pond, muttering, we maintained our calm and radio comms and the TD arrived at the speed of an express train to deal with the situation.
Once it was safe to resume, the rider went back up the course to an agreed place and resumed. Nothing was lost because we Fence Judges were timing every pair past our timing marker. Lesson learned: ANY fence may need to be a stopping fence.
Edited for typo