
Bahumut |
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So, the way I read it, there's the unmodified 'Leap basic action', that requires no Athletics check, takes one Action, and allows you to do one of two things: (1)Horizontal 'Leap' - Jump up to 10 feet horizontally if your Speed is at least 15 feet (or up to 15 feet horizontally if your Speed is at least 30 feet), or (2) Vertical 'Leap' - jump up to 3 feet vertically and 5 feet horizontally, onto an elevated surface.
The Powerful Leap feat upgrades your 'Leap basic action', increasing your Vertical 'Leap' to 5 feet vertically and 5 feet horizontally (maybe 10 feet horizontally, depending on how you parse the comma) without requiring a check, or allowing you to jump up to 15 feet horizontally if your Speed is at least 15 feet (or up to 20 feet horizontally if your Speed is at least 30 feet) without requiring a check.
High Jump and Long Jump are Athletic skill checks that reference or modify the 'Leap basic action', dependent on success or failure, and take an additional Action to perform. If you Fail or Critically Fail, you Leap normally (perform the 'Leap basic action'), Leap then fall prone, or fall prone without Leaping; If you Succeed, you increase your maximum vertical jump height to 5 feet/increase your maximum horizontal jump distance to X feet (whatever the successful check result was), and a Critical Success increases this even farther for the High Jump.
It looks like Powerful Leap is mainly a hyper-Assurance/Action-Economy boost for the High Jump skill check, while Quick Jump is an Action-Economy boost for when you *have* to attempt a check to overcome a challenge; A DC 30 Athletics check won't be able to be made with Assurance until level 14 (with Master Athletics, to boot), while a character with Powerful Leap can pull this off at level 2, Expert Athletics, and no check needed!
I can't speak for the developers, but I'm guessing the reason a lot of feats modify things *to* a certain number, rather than *by* a certain number, is to prevent stacking shenanigans; Whether this is a Pro or Con of the system is a matter of opinion.