I understand that my knee-skin was torn/burnt in one direction or another all at once...but why does it hurt so bad?
your skin is sensitive. your skin chafes with the rug, causing friction which burns
The reason rug burns hurt so much is becaue you are only scraping the top layer of skin off. That exposes all the nerves under the top layer of skin. These nerves are usually covered so they are sensitive.
