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At first I figured that the Kensi/Deeks kiss was being ignored because this is a procedural show on CBS and that is what they do, but then it came to me!: Peter Bishop used the machine to move everyone to an alternate universe where they never kissed. IT’S SO OBVIOUS I CAN’T BELIEVE I NEVER REALIZED IT UNTIL NOW.
And the only person who remembers is Hetty because she is an Observer, obviously.