It is in the nature of humankind that there will be those who do not fit in.  When those humans appear, many things happen. It is in the nature of the others to not understand those humans.
That witch humans do not understand is vulnerable to hurt.
They don’t understand so they left their own kind behind.
There lives a human being who seems to disappear. They don’t show their true face because they fear falling behind. Slowly they show themself and slowly they fall behind.
In the end they are content, even trying to, fall behind.
They live on.