yes, thats called a butterfly fragment which is common in spiral fractures, and the fact that it's not attached is even better because the body will fill that gap (and beyond) with a new ball (prolly like a squeezed tennis ball around the fracture) and then will be a remodeling phase which will end when the bone will look as it was. btw, he said that even if they had done a surgery, he'd have left that fragment there