Seems perfectly applicable to the thread John, and very well spotted, you possibly saved that young girls life.
I have the opposite story, on my test in 1986 I didn't do an emergency stop. The examiner had got me to pull over, he said in a minute I'll ask you to drive off and I will then bang my notebook on the dash and shout stop. So off we drove, he shouted stop and I carried on driving as he hadn't banged his notebook on the dash. IIRC he shouted stop a second time, at which point I said I thought you were going to bang the dash with your book. He still passed me, so the rest of my driving must have been OK
I passed my HGV test three years later, although that was on the third attempt, first time I ran the cones over reversing, I still think they were setup wrong as I was really good at reversing as I used to reverse into the workshop and onto bays long before I passed my test (private land not public). Second time it was lack of progress, the truck would only do 40 flat out and I was on a dual carriage way that was 50mph limit, needless to say the workshop foreman made some adjustments when we got back.