Crab, I wouldn't dream of criticising you for that incident any more than I would criticise the gentleman from Welshpool. From a practical point of view any accident during an instructional flight is technically, and sometimes largely or even wholly the instructors fault. But that doesn't mean you shouldn't acknowledge some role for chance in your fate when it's appropriate. Without the benefit of more detailed knowledge, I'm prepared to acknowledge the role of chance in the Welshpool incident, and knowing you by reputation only, I would grant you the same courtesy.