well. the reason you did the pushback change was to make it more fitting. but now, as i see it, a pushback will either be OP or UP on him (50 range sucks, but i agree longer would give him too good escape :S). so, why not make it what you essentially want it to be: something fitting that stops the enemy for a short while, and has a unique flavour to it.
lets make it spin the enemy around for, idk, 1 or 1.5 seconds. just hold him in place/"stun" him by spinning his model around. this CC is a bit unique, very fitting, and accomplishes what you want it to.
visual would the thet the wind ball explodes and the winds inside it engulf him and spin him before dispersing.