At the start of TTK we see the Harbingers being used against the dreadnought (as far as I'm aware) and they did nothing. Yet the Hull Breach playable area exists because the Cabal apparently crashed a ship into it. So how did a ship make a humongous hole in the Dreadnought when the Harbingers did nothing ?
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Clearly the cabal didn't reduce their speed completely when doing out of nls, or the kinetic energy was enough to overpower the dreadnought's shields in a way the harbingers could not.