You should end up past the second opponent from the direction of the primary target, or if there are no other targets in range, past the primary target from the direction your character was standing.
That skill may still be useful to teleport and do some CC, but will only reliably get you near an opponent. Depending on the enemy configuration you may be able to make it more likely to jump to the opponent you want, or to get closer to backstab position, but the results are inherently random.
A high speed will increase the distance you can move per AP point, and if you move once in a turn but do not use up that distance, you can make additional moves up that that point without using any AP.
