Consider the potential outcomes of a given situation.
To work out the truth, one must compute the probability of every possible result, then the most likely must be correct. This method works fine, until one adds a random factor.
In this case it is humanity. Contrary to their own belief, humans do in fact work to logical and definable rules, but those rules are so varied and complex that the computations become almost endless, a near infinite program to deduce...
Video input: Movement. [Focus] A hand, waving? Deduction: An attempt at communication, maybe to attract attention?
Audio input: ""Would you happen to be able to find the base, or are we stuck looking for it?" Deduction: Definitely communication
ThreeWords canceled the prediction program and responded to the question
"We should search for nearby energy use. Since everyone's been evacuated, the only person using any kind of power will be Carter, and her robots all radiate a unique energy signature."