Also sprint slide works great. The limit with blink is for that split second they can't see where the are going and can't turn around so sprint slide and turn around will often leave you far enough past to be safe from the shotgun and kill them
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He's right. Blink carries a forward momentum so you can slide forward and turn around to catch the blinker as they come out of it. If you double jump straight up when they jump you'll be above them and have a good chance to shotgun them in the head while they're hitting your feet.