Let me start off by saying that im no professor of any kind, i am simply a high school student in way over his head concerning particle interactions. Without a class to teach me, i have used the magic of the internet to attempt to get a rudimentary understanding of these interactions. I understand (somewhat) color charge and how it works, how the gluons facilitate the color change. I understand that in simplified terms, the strong interaction between hadrons is like excess color force from inside the particle. What i dont understand is how pions facilitate this force, for all i know i have this all wrong. the information im trying to understand came from this picture. Any help by explaining this picture would be great, preferably in layman's terms with as little math as possible.