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Given Acumen's ability to "lose" people, so to speak, it's still the most likely possibility. [She pauses, taking a moment to think it over. People returning was frequent enough, but it was a lengthy period of time... Not to mention how frantic he seemed over the matter.] Perhaps it would be best to seek out any acquaintances you recall having. Should any of them still be here, its likely they can shed a bit more light on the situation for you.