Fairytale Scene - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 468

Figure 9.68
Now you'll see why we saved the selection of the children earlier—we can use it
to remove the light from them very quickly.
10. Go to Select > Load Selection, choose children cut out from the Channel menu
( Figure 9.69 ) , and click OK.