People with narcissistic personalities such as TC tend to be extremely charming. They have two completely different sides to them - the one they show everyone else, and the one they show to those they abuse/'love'. He is probably (and has been) mentally/emotionally abusing ET without her even realizing it. Especially since her mother's abuse was physical and his abuse doesn't leave (physical) scars. She probably doesn't even know how to put her finger on why she was concerned about seeing him at work or leaving with him. Narcissists are very very clever in tearing down what ever amount of self esteem their victim has. He probably has her convinced he is the only one who understands her pain. Her schoolmates (and other teachers ?) shunned/bullied her regarding their relationship/kiss/his being fired, how perfect for him to 'be on her side' and tell her he doesn't blame her.
He probably shows a completely different facade to the other teachers and students and that is one of a great guy, affable, likable, charming, supportive, etc. Probably why people were upset with her and supportive of him. Narcissists are very dangerous, very cunning, have absolutely no empathy, and are completely and solely out for themselves only. I'm betting JC is thrilled he is gone. Their kids probably are too. Although I'm guessing they're sorry for ET getting tangled in his web. They know what she is (or very soon will be) going through with him.
Narcissists are nasty in their home life. Very negative, very pissy, and are only out to make themselves look good to the outside world. Their victims become very focused trying to keep him calm and nice, dreading an outburst and trying to keep the peace. For a narcissist, it's all about the facade they put out there to look as if they are better than everyone else. Look at his 'lifetime achievements': millionaire, CIA, etc. He is probably lieing and telling people (if they meet others along the way) that she is 18 and isn't he the stud (butt-ugly) 50 year old that can get a beautiful '18' year old. Maybe they even got her a fake id (I know many college freshman get these very easily on many campuses, sadly). I know she is only 15 and looks young, but at my age (50s) anyone under 30 looks like a baby to me, especially 18 year olds. I would have trouble telling the difference between a 15 year old and an 18 year old.
The saddest thing about narcissists, is that so many others think they are great people, high achievers, when in actuality, they are miserable trying to take those they 'love' down to their level of misery. Fortunately, most people never experience having a narcissist in their life - they will never comprehend just how bad life is with one and I hope ET isn't experiencing this side of him (it usually takes a while for a narc to let his real self out and show the ugly).
I pray every night that LE finds these two and saves ET from TC's disgusting grip.