When the nature elementals of fire and water fight, it may seem like a petty catfight (just your typical sexy femdom, eh?), but the loser's side in the natural world is thrown out of balance -- with catastrophic results for anyone living nearby.
I like 2 haiku versions for this tale:
1:
Water-maiden strikes,
flame-sister fades into ash—
the earth screams in flame.
2:
Water quenches flame,
ashen silence fills the air—
mountains bleed with fire.