The Dash Move is the final unlockable ability given to Zephyr that allows him to quickly move around the area with the tap of a button.
Freeing Water Whirls
Use the dash move to burst one of the two pairs of Water Whirls. Then, dash quickly to burst the second one; this will reunite both sisters together and will count as a collectible.
Much like the Stone Stomper, growing too large will result in them getting tossed into the air.