This can also be useful if you have more then one enemy, combined with Stampede this will let you use Ravage without prowl and at 50/100% energy reduction.
Whether by glitch or intent, this does not break prowl or enter you into combat, giving druids something of a watered-down version of the rouge's ever hated Sap. And while 3 seconds of reduced speed (50% speed reduction) isn't much, it does offer a rare and powerful form of Crowd control in PvP situations: Paranoia! Many players will spend quite some time casting AoEs in an attempt to find you after you daze them.
This can also be useful for getting around by using it on a mob on a cliff above you or across a small gap.