The Two of Swords is the card of indecisiveness, avoidance and precarious balance. The Nine of Swords represents extreme stress, nightmares and negative, external influences. It is also a card of painful endings. The combination of the Two of Swords and the Nine of Swords shows a stalemated situation that fails to be resolved.
To understand the elemental relationships between the cards, we should always take into account their actual meaning. The elements of the cards in this case are Air (Two of Swords) and Air (Nine of Swords). Two Air cards can generate quite a powerful and intense combination. In their negative expression, these two cards will bring feelings of restlessness, failure, futility. In most cases the strong air of these two cards cards shows a dynamic situation that's subject to change.