Timeline: Beginning of Part 6 to End of Part 7
After Sirius's death
Falling Through the Veil (privately connected to Hogwarts)
The curtain kept his soul
He who died
The soul is dragged to Hogwarts
Possessed by Snape, the only member of the Order of the Phoenix left at Hogwarts at the time.
Become a being that resonates with him
He can communicate with Snape
Even peeking into his mind
But due to Snape's proficiency in using Occlumency,
Only when Snape takes the initiative to reveal his thoughts
Only Sirius can sense it
Also affected by the Patronus Charm
Whenever Snape releases his Patronus
Sirius can use this power to become a physical entity
Intention: None
