Discovery reaches the point of no return
On the whole, "Rubicon" is a well-executed series of cat-and-mouse games between Discovery and Booker/Tarka, with the suspense upped by the parameters of the personal stakes and the ticking clock. Book and Tarka are very close to being ready to deploy the isolytic weapon, and only Discovery now stands in their way.
Burnham has to figure out how to stop them, starting with a hopeful, last-ditch appeal to reason before moving on to potentially deadly force (but first a lot of warning shots). Meanwhile, Stamets attempts to predict the rate of the DMA’s consumption of raw materials in its current region of space, with the logic being the efficiency of the DMA will deplete all available resources before deciding to go somewhere else. If Stamets can provide that estimate, perhaps Burnham can use that information to convince Book to stand down while the first-contact plan is undertaken.
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