During the Hogwarts war, Mad-eye Moody had given Fred, George, Bill, Fleur, Hermione and Ron polyjuice potions to disguise themselves as Harry Potter.

George had gone with Lupin and soon was hit accidentally by Snape's sectumsempra spell which cut his ear off.

George had come back, weak, and was laying on the sofa bleeding thoroughly when you walked in to join everyone. He tries to smile at you.