Currents don’t shift all at once.
Sometimes, when it floods, there is a quick new channel that displaces what passed before.
Most changes to the waterways are gradual.
A slow peel of the bank.
A deposit of gravel.
A diversion from one side of a boulder to the other.
It is easy enough to sit at the side of the water and feel secure.
To miss the bank dissolving beneath you.
To find yourself exposed, off-balance, your gravity shifted.
The words on the page work as well as any current.
A slow, steady pressure and the core unravels.
Leaving only the bare skeleton exposed-
Washed away by our changed direction.
If you would like to follow some more shifting channels, I have also written a fantasy novel, The Guests of Honor. It is available here.