Each card is one match moment: football (open play, corner, free kick, penalty, kick-off), rugby (scrum, lineout, ruck, open play, kick-off) or ice hockey (faceoff, rush, offensive-zone play); stands full of spectators in the teams' colours; everyone on the field wears the same camera (ear unit, or on top of the hockey helmet). Broadcast cameras first, then the egos' own cameras. Track A query: given one ego view and one exo view, pick the one who wears it.
setting class same individual