It's like you hate me.
[Sam feels a little nervous when Elena goes to ask a question. He's not sure how she'll take the concept of this class or what she'll think of it or him as a teacher. And while there are plenty of supernatural issues that factor in, there's also the very simple issue of boy impressing girl or at least not embarrassing himself in front of her.]
Anything is possible, and I've seen ghosts who were more protective than anything else. [He's thinking of his Mom right now and the way she protected them from an angry spirit in the house he was born into. It's a heavy thing to draw on, and he's definitely not going into that in class.]
But that doesn't mean they wouldn't change with more time. [Ghosts are like coal. They just need pressure and time to turn vengeful...or into diamonds. Whichever comes first.]
There's still a lot we don't know about them. [Hunters tend to learn enough to hunt and kill and if they have those bases covered they move on to the next topic because there's always something else making people die bloody.]