Never heard of it being called ‘BLACK’, but it’s the way I do it anyway.
First artic job I had at 21, , I pulled the pin first when the full outfit was sat on an angle, to see a loaded flat trailer of steel coming towards me…could have been a very short driving carreer if my reflexes were not as quick… 
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The o/p said about getting shouted at,… I certainly did that day and deserved it.
As for the prck shouting at you as if you’re a schoolboy for doing something maybe not in the right order, but arguably ok.(what’s the worst that could have happened ffs) …he should have been told to go and ■■■■ himself. 