[Autumn]

I find making it passive and keeping it airborne only a infinitely more attractive proposition, design/fluff wise.

Is there any reason for wanting it done this way? It'd still be a buff you have to reapply for 3M every 3 turns.

At ranks 3 and 5 it does gain an additional +1 duration so its not every 3 turns, the buff still has to be applied yes but you're not always gonna be in range to kick a target, 5 round duration is plenty of time to make a bit of use out of it anyways.

If it does become a passive it might just be a "Why not take it" skill, because it'd be free damage so long as you have access to put people airborne, like with Dragon Gale/Point Kick/Korkenzier (Though in Boxer's case its abilities are not kicks.)