Ok... this has happened to me like three times now. Most notably in the Alex (normal) run where you have the two Oppressors. It also happened in Bismark Ex.

Whenever there's a mechanic where I have to provoke something, I'll hit the button, Provoke will go off, you'll see the little animation on the screen, but it won't actually provoke and I won't get aggro. The icon will also not show a cool down.

Just wondering if this has happened to anyone else?