Yes, but that's the point. I never picked on someone who I felt would fight back. I don't know how I developed this intuition as a kid but it was fairly accurate. The thing is if the kid fought back then I would probably have picked someone else. It must be hard for the bullying victim but it's something that has to be done.

This link you gave is interesting. My corollary to this is as a victim, never do favors for your bullier. It only makes you look weaker in their eyes and it will only spur them on. For me, the only solution is to fight back and make yourself not look an easy target.