Harry Potter and the Deathly Five Dollars

In the scene where everyone changes into Harry (in the actual book), Harry was changed into some older guy.  A fight broke out, and while it was going on, Harry started changing back into his own form.  After the fight was complete, they were out in this big destroyed city area, and Harry's transformation back had stopped early.  He had a section on the right side of his head (his right) that was still bald.  Even though I was just a "viewer", I took a five dollar bill and wiped it across the untransformed spot, and it went back to normal.