You brought a wry smile to my face britbrat.

Although I'd usually have a heart to heart earlier in debrief stating point blank the pointlessness of and that I simply won't continue to instruct them without them enthusiastically applying an attitudinal re-alignment, I have also found your methodology an effective technique - when said types fail to respond to effective instruction and insist they will land off a hopeless approach regardless. No not "I didn't hear you" load shedding. Just plain old arrogant obstinacy.