I've been playing around with a lot of different vigors and weapons, and a lot of times I notice the words "vulnerable" pop up on the screen. This happens when I use Murder of Crows, Shock Jockey or Bucking Bronco, and even sometimes after melee attacks (though I have the Electric Touch hat on, so maybe its related to that). From what I have understood, its some kind of damage multiplier. However, I'm planning to do a 1999-mode run after this one, so I decided to ask it here -
How much is the damage multiplier? I'm guessing 2x, since on Normal I kill almost everything with 1 head shot anyway. But then, IIRC, in the original Bioshock Electro Bolt increased damage to 400%, so maybe its more than 2x.
How long does the enemy stay vulnerable? Because the word "Vulnerable!" itself just comes up for a split-second. Does this multiplier stay on only as long as the effect of the vigor lasts?
If someone can tell me exactly which vigors/gear can cause this effect, I'll highly appreciate it.