Okay, so I just thought of this weird, loose, headcanon
So, when Episode 4 of Legend of Korra came out, several people were appalled that Tarrlok had his arm around Korra’s shoulders:
There was a slight controversy. Apparently, people thought that was inappropriate, and that Tarrlok was a creep, etc.
But then I realized.
What if he saw how nervous Korra was, and actually tried to comfort her?
Because, there was once a time when he was comforted by someone putting their arm around his shoulder.