Silent Hill Questions-I Have Questions About The Movie And Game Of Silent Hill,see Details Below?5-23-08

In the movie Silent Hill, why didn't Rose walk back up the stairs when the siren starting sounding and everything began to change-reverse side where did the demons and monsters in the Silent Hill games come from and what is the purpose of the monsters How did the town of Silent Hill get haunted any way what is the purpose of reverse side anyway in the game of Silent Hill and in the movie are you looking forward to the movie Silent Hill 2 in 2010.