Instead, turn the comb outward. Don't go past the middle of the ear when cutting or you'll be digging into the back, which could create a hole. It's from the middle of the ear downward that you will blend to make the frame for the back of the hair. To make that frame look fuller, work more straight up and down behind the ear. If you just relax the wrist and cut backward at a diagonal, then you would take away too much hair.
Tapered comb is best for detailed work around ear.
Cut straight up and down behind ear.