We'll just have to agree to disagree on its current usefulness. Given most of the time I would currently use it is when I see a Ninja use Hide, I'm more likely to use Death Blossom on them, rather than something with such a steep cooldown. Every time I use it it feels like a waste, because I use it when I don't know a Ninja is there, and usually there isn't. And yeah, Stun was just an example. I think it would be more poetic to hit them with the same damage taken debuff Trick Attack has :P