Mixed animation works well when you, for example, would like to place a longer quote over several slides. you can try to turn on/off the animation in some of the slides to create a more smooth feeling.
All animation settings turned on
Notice that the number of animation settings might differ depending on the slide type.
Mixed animation settings
In this example, we have chosen to have the plate, quote sign, and text animated IN but not out on the first slide. On the following slide, the quote sign, plate, and text will be animated OUT but not in.
Notice that the number of animation settings might differ depending on the slide type.