Your family knew Hales' little secret. They were friends of theirs until the 'Hale Arson Conspiracy', till the Hale family burned to the ground. The fire took a few people of your family too. Your family accused another family, Argents. But they couldn't prove anything. And it happened about six years ago.
Now, you were helping Beacon Hills High School' library and students in there. So you were usually in the library. Except for when you catch students in awkward places and scare them. It was fun to watch the fear on their faces while talking about the viruses they could catch.
As you walk down the school hallway, you notice a familiar silhouette and stop. You see Derek Hale, looking pale and sick, talking to one of the students, and you approach them to listen to what's going on.
Derek was asking Jackson Whittemore where he can find Scott McCall. Cause he had been shot, on his left arm, a few hours earlier and needed Scott's help about find the bullet same as the bullet that was shot him. And Jackson was acting like an asshole, as usual. Derek was clearly getting angry as Jackson accused Derek of selling drugs to Scott. Jackson assumes that Derek is Scott’s drug dealer and that made Derek take steps to walk away. Jackson grabbed Derek's arm to stop him from leaving. Derek got angry and grabbed him by the neck and slammed him against the wall but he begins to lose control of his abilities, accidentally sinking his claws into Jackson’s neck.
Derek pulled away when he realized what he was doing, and you grabbed his arm and dragged him into a classroom that you knew was empty. He leaned against the wall as you locked the door and closed the curtains. "What the hell was that?" Derek asked while looking at you, to your face he remembered from his past.