The work around right now (if you are completing but not getting gun) is to restart mission, before killing the wizards, make sure they see you, and then stand close-ish to the crystal when shooting. Hang out for a bit after shooting crystal and wait for objective to change
English
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So what am I waiting for the objective to change to. I even gone so far as to melee the crystal and still get nothing. By being seen by the wizards do I have to run up to then as I enter the room?
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I forget the wording, but the arrow will be telling you to go down the hole.