I don't think it was exactly like this situation. The girl you worked with is not comparable in large part. First, how they met is very relevant. In this case, Elizabeth's predator was her teacher, in a position of authority over her. That's how they met and that is significant. Second, ET was previously abused which the predator knew about. So she was vulnerable, as children of abuse are uniquely suspectible to further victimization and he exploited that.
Third, it is clear in this case that ET, based on multiple reports, was
scared of the guy, hid from him, was threatened by him and forced to go out to eat with him in the past, was conflicted about going with him the day he took her, saying to her friend that she didn't want to go, expected or wanted to be home that evening and even told a sibling to get help if she didn't return by a certain time.
ET was not some headstrong, incorrigible teen acting out and being taken advantage of by a creep. She was scared. And threatened. Yeah, she may have also been flattered by the attention and had fantasies about that but she wasn't a teen stubbornly fighting to be with some older man. She was scared.
In both cases the predator is exploiting the teen and grooming them. In both cases the minor is being abused and victimized whether they understand that or not. But in the latter the teen is more vulnerable, more damaged by the abuse and more in danger. IMO.
TC is armed and has nothing to lose and is with a kid who doesn't really want to be there.