[Her gaze drops down to the hand on her wrist as if contemplating it, and then her eyes lift back up to Stiles' face.]

Explaining it would take too long and possibly means giving you more information than you want to know. The long and short of it is, someone tried to strangle me.

If you want me to go into it, [There's a pause as she looks around.] Later. After the party. This isn't the right place. [It's serious business, and Lydia doesn't want to bring down Ginny's party.]