Scream 3 ending explained (spoilers)

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The killer draws Sidney to Miltons house with Gale and Dewey as hostages. He then chases Sidney before revealing himself.It's Sidney's long-lost brother, Roman Bridges, the director of Stab 3. He also claimed to have been the mastermind behind the murder of Sidney's mother, which was then the catalyst for Billy to start the killings in Scream! Roman shoots Sidney, supposedly killing her. Sidney then gets back up and stabs him revealing she was wearing a bulletproof vest. She stabs him three times. He then gets back up, seemingly invincible before Dewey puts a bullet in his head. Dewey proposes to Gale who accepts and Sidney lives happpily with Kincait supposedly living with her. Just before the movie ends a door swings open and Sidney smiles. The door suggests that they are literally leaving the door open for another sequel.