One of our transition rules is that the first three guys go in the clear. This could mean three poles. It could mean two poles and a short. We don't want our poles bailing out early and going for a sub because we lose a member of our transition offense. Of course, you have to develop your poles stick work and offensive mindset for them to remain on the field. Here Army's long stick joins the break, doesn't touch the ball, but makes a huge impact on the eventual goal.
By filling the crease, the pole subtly seals the high defender who is then late in getting to the shooter. Easy goal for a D1 middie.
If the Army LSM leaves the field early in transition, this is only a 5v4 break instead of a 6v4 break and maybe they don't get a great look from inside the shooting V.