May TS is person C.
Based on my assessment, the activity should include Person A, Person B & Person C.
Therefore activity ABC. Since TS is the third person, he is wondering if still continue to
proceed the event alone. Despite the activity is supposed to attune to likes of A, B & C,
2/3 of them expressed not interested. This is a difficult situation for C where to go with
the crowd or simply tell the organizer the truth. It might made worse if the organizer
(possibly the boss) ask him to poloso the other two to go.