Why did Billy kill Casey?

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Tags

1. #because
2. #billy
3. #which
4. #about
5. #ghostface
6. #loomis
7. #casey
8. #unnamed
9. #conversation
10. #dumped
11. #horror
12. #murderer
13. #night
14. #murder
15. #implied
16. #began
17. #never
18. #while
19. #stated
20. #explicitly
21. #watch
22. #costume
23. #killed