Again, before Haley died, the egg timer reappeared in places where she least expected to see it. So Matt’s missing lock isn’t a great sign for Matt—it’s possible that the killer is lurking somewhere nearby, waiting to strike. Another thing to consider is the killer’s motives for disturbing their victims by moving around their personal effects. The killer seems to find pleasure in watching their victims doubt their intuitions and become increasingly paranoid. The killer relies on the idea that high schoolers are too concerned about what others think about—about being the subject of cruel gossip, perhaps—to trust their intuition.