Before GM'S come out, something has to be done. These things will be more dangerous than the boss. They already are a pain in regular Nightfalls. These things are hella tanky now, and need a crit spot. Preferably where the launcher is.
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I can't lie, they are annoying, in Nightfalls or otherwise. The only thing I can think of in the meantime is to focus down the Thresher early. First, if possible.