Mark Rosen is all about finding ways to disrupt the opposition's flow. One of those techniques is executing a short serve to slow down the offense, giving your team ample time to set up a stuff block.
When teams are faced with a short serve, the pass is often rushed and the hitters are taken aback and must quickly adapt, but often that time adapting actually slows down the offense. This gives your team the time to set up a block and take advantage of a slowed down offense. Play with short serves during practice and see how it changes the opposition's offensive flow.