Can you change the this of a function that's already bound? What does this log?

function show() {
  return this.id;
}
 
const a = { id: "a" };
const b = { id: "b" };
 
const boundToA = show.bind(a);
const rebound = boundToA.bind(b);
const holder = { id: "holder", show: boundToA };
 
console.log(boundToA());
console.log(boundToA.call(b));
console.log(rebound());
console.log(holder.show());