Get node doesn’t require “power”.
SET node without “power” work just like GET node, it doesn’t affect value, it just give it forward.
When you supply SET node with “power” you change Int variable to be exact same value as pinned (or typed) on the left side of the SET node.
So when SET node is not executed (only way to execute it is pressing T in your case) it gives default value or one which is set by upper SET node which you just executed by pressing R.
Look, both cases below work same way.