Cull Obsidian NOT working as described

When Cull Obsidian is holding block to gain his rout buff, if the opponent hits into his block the timer stops and goes away. I have to dash back and start over. Nowhere in his abilities description does it say this. I have videos of this happening if needed. Please help!
0
Comments
Might not be a character bug, but rather a hold block timer (in general) bug.
One is great for ramping up with multiple fights and the other is best for short fights, but I have yet to apply these consistently. Is this champ bugged or working properly?
BTW: mine is 5*r4 sig 130 Cull Obsidian