This quote comes from The Silmarillion, 19 Of Beren and Lúthien, and hints at a peculiar characteristic of the Ainur's shape-changing abilities. Injuries sustained in one form - in this case wounds from the battle with Huan - seem to persist to other forms. We see this again in The Lor...
but it is when you're a 10 year old kid. I wanted these pieces to be removable for when we needed to ride in the car etc. So I shaped the pieces of foam tile with the heat gun to fit and then glued