Asdf1234!
The turn back procedure was taught in RN elementary training in to the early 80s.
By the time I was back there instructing in 1989, it had been dropped from the syllabus, reason being it was thought more dangerous for inexperienced pilots to fly this manoeuvre than to accept what terrain lies ahead.
Key word is inexperienced.
This Spit was not being flown by such a man.
It, and he will fly again. Had he followed your text book, I doubt either would.