I just noticed the "Shove" action allows a success or critical success person to move after the enemy that was shoved (only up to the amount of movement shoved) for free, but a "Reposition" action only allows you to move a person within your reach and you cannot follow after it unless you spend a stride or step action to do so.
In my mind, I feel like reposition could be dragging an enemy into a better position to flank with an ally, or dragging the enemy away from your teammates while moving.