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OK the buzz is about Vi being nerfed but this isn't about that.
It's about her passive not doing what it promises.
Innate: When Vi's activated abilities damage an enemy, she gains a shield equal to 10% of her maximum health for 3 seconds. Blast shield has a 18 / 13 / 8 second cooldown.
In-game, I notice it being less than 10% of my current health. I think that Blast Shield isn't taking into account Veteran's Scars or Juggernaut mastery points in its shield, thus it's less than what you should expect from it.