They pass through the doorway to find a large warehouse of crystal balls , but no Sirius .
Dumbledore 's Army springs into action and heads to London to save Sirius from Voldemort .
Dumbledore 's Army pass through the doorway to find a large warehouse of crystal balls , but no Sirius .
Dumbledore 's Army springs into action and heads to London to save Sirius from Voldemort .