When the killer is in her sister's shop, he turns the lights off and Helen, (Buffy) walks towards the back of the shop. But then he is a mannequin. How did he get there so fast? He couldn't have got still so quick.
Okay first off Buffy is her character on a TV show the actress's name is Sarah Michelle Gellar. Second of all it's supposed be like that. The scary things is how the killer can do all these things that seem impossible. It's supposed to leave you wondering.