Mr Nosy
Just to complete the picture, the accident which prompted this thread was nothing to do with loss of yaw control.
SASless
It does look as though the poor chap got his approach badly wrong but he couldn't have had better training.
When he bought his Gazelle, he was checked out by a very experienced and respected instructor/examiner who is an ATPL, ex Army Air Corps and flies Gazelles in the TA (Army Reserve). And, the pilot had passed a currency check earlier on the morning of the crash.
I suspect it was just 'one of those things' which unfortunately happens now and again.