First of all, local examiners will not invigilate local candidates;
Secondly, the examiner, like the examinee, will draw lots to decide which room it is in the examination room. Moreover, there is not only one examiner, and it is basically impossible to meet an examiner you know.
And at the moment you finish the interview, you will judge the examiner's score and inform the result on the same day. National examination and provincial examination are hard work.