I haven't seen the skill tree, but my friend just got it last night. The normal jump is that short distance hop, but I remember him saying that if he presses the jump button three times (or something like that) he does a super high one. It sounds like a situational option to me: normal jump for quick distance hopping or the vertically fast and superior version (but seems shorter/slower horizontally). But don't take my words as absolute - I'm just a Hunter who repeatedly gets himself killed trying to learn to Blink.