everyone and they are not an “antecedent” and a “pronoun” referring to the same person in the world, which would force them to agree in number. They are a “quantifier” and a “bound variable,” a different logical relationship. Everyone returned to their seats means “For all X, X returned to X’s seat.” The “X” does not refer to any particular person or group of people; it is simply a placeholder that keeps track of the roles that players play across different relationships. In this case, the X that comes back to a seat is the same X that owns the seat that X comes back to. The their there does
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