Inaccurate?

Wings of Bounding

(Races of the Dragon)

Evocation [Force]
Level: Sorcerer 1,
Components: V, S,
Casting Time: 1 swift action
Range: Personal
Target: You
Duration: Instantaneous

Immense, partially translucent wings unfurl from behind you for an instant just before you jump, helping you achieve incredible distance or height.
You evoke immense, partially translucent wings that grant you a +20 circumstance bonus on a Jump check you make in the same round when you cast the spell.
In addition, if you are intentionally jumping down from a height and you succeed on the DC 15 Jump check to do so, you take falling damage as if you had dropped 30 fewer feet than you actually did.
Special: A dragonblooded character, or a character with the dragon type, gains an additional +1 bonus on the Jump check for every two caster levels (maximum +10).