You will find that persons who are having a rough time or giving others one are either just leaving or haven’t arrived on the post. In other words they in some way are not actually ON post.
It is also an oddity that those who have to go to point B haven’t arrived ever at point A in order to be able to leave for B.
The ability to BE something strongly shows up in post performances. The real stars can BE anything wholly and completely for short or long periods. They ARE what they are being. They aren’t just arriving or leaving.
To BE OR UnBe, that is the ability! To not quite be or to WAS is the aberration.