Bami cinder line buff. Great, but I think they missed something

As a person who's mained cc focused tanks in the jungle and support since season 2, I love this buff (cc triggering additional dmg). The issue I notice however is that some engage champs don't get full value out of this buff. Sounds weird right? Problem is, the nova triggers as soon as the cc happens regardless if you're in range for the nova. So, characters like Amumu (who always builds bami) who hit a great Q will not be rewarded with the burst of dmg if they weren't already in melee range because the nova triggers before he get's to the target. The fire nova should trigger at the end of the ability rather than the start of the animation, maybe an interaction similar to aftershock which triggers after a delay could be even more fun and flashy if the animation is changed. Would love to see the devs fix this.