I do believe its bugged actually. I would think otherwise if you did the hs's and were stunned when actually using the tsunami, similar to unleash. But you're facing one way, in a different location, when tsunami is on the other side of the world.
Same with frank and 8 tri-grams.
Uchihas and chidori and fireball.
Moves have gotten slippery since the update. Not that I mind the uchiha slipperynesd, ahem.