We got to wave 50 in onslaught. At the door to the final boss room the bottom node that ya shoot to open the door would not respond when shooting it
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Witness changed the locks while you were out, it's not you, it's them.
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That really sucks. That happened to me at the boss room on wave 40 only it was the very top node that wouldent respond to shooting. We could not progress so we had to go to orbit. Def sucks.