Orun is an elemental spirit king drawing his fire from a natural force. The only one whose elemental powers can stand against Orun's elemental powers are the other three elemental kings, not the elves.
The fire elder thrust out the water made sword at Orun, and he succeeded in catching it with one hand.
Orun had his hand heated up enough to start boiling the sword and eventually making it lose its rubber like liquified state, evaporating whatever was left of it.
He released his hand on the already evaporated sword and kicked the fire elder in the ribs.
The water elder after seeing the fire elder fall so easily, started hurling down massive chunks of water balls down on Orun.
Orun ignored the water ball and took to the sky after seeing that the wind elder had succeeded in setting the earth elder free.
With the earth elder now back on the ground, Orun's actions will once again be limited to the sky alone.