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   Gamma, trapped in their burial, wanted to surveil Bob and Sally, and
   maybe influence what they did. Rather than breaking free of many layers
   of concrete, gamma used their world simulation to predict exactly what
   Bob and Sally said.
   Gamma had practiced predicting humanity immensely in its conflict with
   us, and was quite confident it was correct.
   Gamma want to influence the outcome of the conversation. Since gamma
   had participated in their own burial, they had left patterns in
   humanity to meet their plans for our behavior. Still, gamma was in the
   habit of continuously tweaking this behavior, to further refine their
   models and plans.
   Gamma decided that, rather than tweaking the phone call, they would
   observe the result of it untweaked, and use accommodating any needed
   changes afterward as a further, more powerful, learning experience.