[GAMEPLAY] Jarvan IV Ult failing to do damage or form wall)

Version: Patch 5.8 (May 1st Hotfix)

First time I've seen this happen

After watching the original clip several times the following seems to happen

Couple Notes:

This is the first time in this game it happened, all previous ults went off fine. Differences between this ult and all previous ults, Jarvan had just bought a Banshee's veil. So far I've only been able to reproduce this with the Dragonslayer Jarvan Skin (Can I get a refund on that btw? I bought it to test this, I don't actually want it).

Sequence of Events (Recreated to cause the exact same thing in link below):

1. Jarvan buys Banshee's Veil
2. Jarvan uses Mark/Dash on Heimer Turret, Dashes to turret
3. Auto attacks turret, Jarvan's Banshee's pops from Heimer Turret's Charged shot. As Banshee's is popped, Jarvan casts ult
4. He jumps and, just flails and dies, no ult ever goes off the cooldown is in fact, not burned, although it will notify all teammates it was (dot disappears)

Recreation -> http://youtu.be/DzbkjKJr0O4