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Sirius had to leave, didn't you see?
The house was killing him.
His family were bigoted pigs; probably plotting to kill him.
He hadn't made any plans to leave; he hadn't unpacked his trunk, either.
If he wanted to leave, there was the Knight Bus – if that failed, the Muggle Underground.
He hated this house, this family, this pureblood-mania. He had to leave.
The House Elf was probably trying to poison him… maybe Regulus was stopping him, but Sirius didn't think his brother was that compassionate. Maybe to save Kreacher's life; not for his own brother.
Sirius had to leave.
