Since the characters are shown facing in opposite directions, the viewer assumes that they are looking at each other.
[1][2] Shot/reverse shot is a feature of the "classical" Hollywood style of continuity editing, which deemphasizes transitions between shots such that the spectator perceives one continuous action that develops linearly, chronologically, and logically.
[1] Bordwell, David; Thompson, Kristin (2006).
Film Art: An Introduction.
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