Well, you should know that ever since I’ve moved to Perth I’ve been surrounded by people who are dedicated F Sayers. And now, a few months later I unconsciously copied that behavior.
It is just what we humans do...
What number 3 doesn't know is that number 1 received secret instructions to copy the Non Verbal behavior of number 3 in an inconspicuous way. No. 2 has received the secret instructions to choose totally different Non Verbal behavior than number 3.
Let alone that they are aware it was probably just because their behavior was being copied.