The pitch attitude is flatter in a side slip. If you keep the same attitude in the slip the speed will be higher when you straighten out again. If you have done this to the groubd you will then have loads of speed, in ground effect, and float for miles.
Take a CD and draw an aeroplane planform on it. Then put it at a slight angle and turn it about the hole in the middle. There you go, a flatter attitude. If you turn it 90 degrees it will be level.
Nothing more satisfying than the transition from slip to flare and three pointer.