The scientific evidence is clear that text on a screen is ineffectual and distracting. Images are perfect for supporting the message of the story. The temptation for speakers is then to attempt to illustrate every single step and detail in the message. The result is akin to a graphic novel.
The supportive media (p2) should not be able to stand alone. Its purpose is to illustrate the message, not mirror it. Rather than choosing to highlight every individual step within a message there is value in sparingly highlighting themes and important sections. Thus the media is supportive.