While me(Druid) and my friend(Warrior) were doing 2v2's we went against a lock/priest combo and the warlock was casting fear I was obligated to feral charge him to interupt and it was about ~0.1 second's till it was finished casting, and the charge went off but didn't interupt and i was feared, but i had full control of my character and ALL of my moves and i had the fear debuff and the graphic was still above my head.
Fairly useless and unlikely to happen unless you master it.
~Kexler