And there, but for God's good grace........
Not happened to me yet (or been close) but I've seen other's come within an ace. I've even seen one guy
retract his gear on short finals. Bit like opening a sweet and throwing the sweet in the bin and the wrapper in your mouth.
Their future careers are based upon results (and that of the school come to that). Consequently they don't 'teach' any more, they concentrate on passing exams.
Last time I looked the average time an NQT stayed in teaching was five years.