The Knight of Swords is logical, witty, analytical, just, but he can also be impatient, judgmental, ruthless and verbally aggressive. The Four of Swords indicates a break from the routine, a pause, a desire to find peace of mind, a process of healing, of recuperation. The combination of the Knight of Swords and the Four of Swords foretells a slowdown, a decline in activity.
To understand the elemental relationships between the cards, we should always take into account their actual meanings. The elements of the cards in this case are Air (Knight of Swords) and Air (Four of Swords). Two Air cards can generate quite a powerful and intense combination. The strongly moving wind (almost hurricane) of the Knight of Swords will meet the calming breeze of the Four of Swords and from this blending a cooldown of strenous energies will manifest.