Mysterio vs domino

Farinos

Been doing a few duels with mysterio v domino to see if I can counter her heavy to apply poisons for stun immune situations with him being a great counter not having his ability reduced, but some how I still got a crit failure after an sp1
So tried another duel and got it again
So is this a bug or have I missed something

Farinos

Nevermind, it's the unfazed mastery