Observation: Arrival is a memory found in JasKra's chamber during Heart of Stone. It is combined with Observation: Dispersal to create Combined observation: Xenia was alone. It may also be combined with Observation: ERROR to create Combined observation: Xenia is avoiding detection; however, this memory is useless.
As the vision swirls into focus, you watch as Xenia arrives in this very chamber. No one follows after her and she begins heading towards the mouthpiece alone.