I think you never see it called because there is a judgement part of the rule that reads as such.Β
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There is the concept of βin the course of playβ for which the Law allows a player to leave the field without permission even during play (and also to re-enter without permission) if, in your opinion, the playerβs departure is brief, closely connected to and explained by the circumstances of play at the time (e.g., to avoid an opponent or to retrieve a ball), and the player does not thereby gain anΒ unfair tactical advantageΒ by the manner or timing of his re-entry.