You need to understand, it has nothing to do with when the red appears and disappears, the cast bar is the only thing that matters. Many things require you to be out of the red well before the animation for the attack starts.

On the other hand, you can get a jump on your attacks if you know when the cast bar ends. For Garuda blasts and the room aoe on the last boss of AK, for example, I am out of hiding and back to work before the animation starts, it looks like I eat it. I probably give teammates in pugs a heart attack every time I do this.