By using the pull of the flock algorithm this allows for natural looking, realistic flocking to emerge. This position could be where there are not any tadpoids, so is an unnatural method. By strategically controlling the predator's movement, a user may learn to coerce the tadpoids and maybe even herd them into a pen. However, if the tadpoids flocking algorithm is removed, the task of trying to 'round-up' the tadpoids increases in difficulty as they have to be penned more or less one by one. The introduction of the predator's influence upon a tadpoid as a summative effect allowed the tadpoid to evade the predator while simultaneously seeking the safety of the flock.
Any comments welcome.