drauk
You are quite right AAIB reports do not apportion blame they just report the facts.
However the run and break has no practical use outside the military and so is not part of the normal training for the PPL.
This makes it very hard for the PPL holder to know what to expect and how to best maintain an effective lookout in this situation add to this a slow and unmanoeuverable aircraft in the hands of a low time pilot and all is set for an accident.