lichmaster
Hero
I'm not a native speaker, but if this is how it's supposed to work I find the spelling really poor for this one.The jump is part of the 15ft of movement.
A way clearer statement IMO would be "You jump 15ft. If there's an enemy within reach where you land, you can make a melee attack on it using the result of an Athletics or acrobatics check".
Also I agree that the usefulness of this maneuver tapers off quickly as soon as one gets extra attack.