I finally figured out how to block and then counterattack, but I'm still not understanding how to interrupt properly. I see the little red sparks coming out and I then hold right mouse button and then hit left mouse button. But I can never tell if it has any effect. Since (I think) you usually interrupt casters, who usually are at a distance to you, does that mean you can interrupt from a distance or do you have to be right up in their face like with block? Thanks in advance anyone can explain this to me!