When doing the event in sorrow's harbor, a witch spawns on an inaccessible ridge where she cannot be reached to kill. It blocks us from progressing past tier v.
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Its doable (I play Warlock too as you mentioned) but you can force it to glitch too. You just jump on the fence by the witch, jump up and light attack will keep you up there until you pop the shield and shoot from the ground to finish... you force the glitch if you continue to chop with the sword and the witch will go too far to be damaged.
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You can kill her you just need to keep spamming the sword until it locks on to her. Having a couple of you doing it also helps.