The blink sometimes doesn't trigger or has a late activation. Like I jump over a gap and press x but it doesn't work until you are about to die. Fix this, and extra distance or bigger "jump" wouldn't be bad also...
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One of the many reasons I use double jump as a Hunter instead of blink. Plus I find blink too predictable in PvP. I can guess where someone is going to blink to most of the time, so I assume the same is true for my opponents when I'm blinking.