Guild Wars 2

Basilisk attacks are unblockable… but I don’t understand why I can’t interrupt the shield of courage.
Obviously we all know basilisk doesn’t work on “invulnerable” skill (DH elite) , but the shield is a block (also the heal skill).
Why it shouldn’t work on these skills?!

It won’t interrupt because it’s not a channeled skill. It’s instant cast and stays up for the duration regardless of what the DH is or isn’t doing.

Your next 2 attacks will still hit and do damage, but guardians trait for Shield of Courage to give stability so you wont interrupt them. Even if they get interrupted the shield will hold on for the duration so after 2 hits they will block the rest if attacks done from front.
You can interrupt the heal skill with it without a problem if you have basi venom pre-casted (if they have stab then with steal).