You're not going to be able to ignite two tubes with one SC. You don't need to go anyway given that the near-field for the straight tube is six inches, and for the Phanotron it's closer to double that. So using the Phanotron at the base of the brain will reach all of it, and a lot of your upper spinal cord.
It doesn't suggest using two plasma tubes at the same time, as there may be too much killing and too much toxin released. You are not able to handle these toxins.
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