However, if the hydra declares its full attack, and Susruko rolls a successful defense, the entire attack is avoided.
I would like to contradict this (sorry
If you attack with triplestrike and the target avoids "the"/an attack, you only avoid the first attack
step 2 of an attack wrote:
If the attack is avoided, skip to Step 5: Additional Strikes.
But in case of Sosruko, you can try to avoid each of the attacks of course...