With this mechanic added more generally to certain skills with FoA.
It would be nice if Inquisitor Seal had some of the existing items also apply this mechanic, some with % chance on attack, and maybe some others when hit.
It would help with the clunkiness of Inquisitor Seal.
And bosses that don´t hit you much and you have to evade a lot will be the worst with this… Making it bigger and lowering the cooldwon is better.
But the time before it takes effect also needs to be solved.
Its why I said primarily on attack linked to specific skill like some of the current FoA mechanisms 
I do mention also on when hit by an enemy maybe, but yeah that in itself has drawbacks but its also a mechanism used in the game.