Though his actions where controlled by the collar, Sirius had free rein with his thoughts.
The man only ordered him to follow his lead. Sirius secretly started calling the man Snape. The Snape- vampire thing lead him to a porkey transported them to a the inside of a building. The building looked like a museum with medieval suits of armor lining the hall, tapestries seemed to cover window openings. The rugs on the floor were to rich to step on yet there where no railings. Sirius then realized that he had taken off his eyes of Snape-man. The man gave a command before falling into what muggles would call a wormhole.

"You are to go back into the house"

Silent ruled for only a second.

"What does mean? What are you doing? What am I going to do?"

Sirius went into a full blown rant (while walking around) which only succeeded in getting Sirius lost.

"Great I'm lost in a old castle that doesn't have a dratted map, there is no way I can get out…."

Feeling like the grand fool he was Sirius apparated to "his house" , even wandless he still could apparate. He landed in the grandmaster bedroom with Buckbeak. Then he felt his free-will leave him slowly like someone was pouring sand into his body; Sirius apparated back to his prison. Sirius tried the Shrieking Shack, Hogsmaid, a villa in France but each had the same result. By this time he remembered the words the stranger told him.

"You are to go back into the house"

He groaned. Out of nowhere a familiar white owl came out from behind of one the tapestries. Sirius fixed his stare on the letter. Hegwig dropped the letter and went on her merry way. The message inside bought the innocent convict to tears.

To any who cares

I'm fine

Harry

He was sadden that Harry would think only one person would care. That got Sirius thinking. What if Harry wrote that to find allies? What if the Order had been killed off?
What if Voldemort had taken over?

Hegwig dropped off the letter like she normally did. Her master never did read the replies. Besides she saw the pain in his eyes each time he saw a new letter in her claws. No she would spare her master all the pain she could. Hegwig stopped for a short time for her meal. She used to hurt her food but there was a familiar smelling man that gave her rats that tasted like a owl treats. Familiar meaning that the first time she saw the green robed man he smelled like someone that she had smelled before. Then the man had called her and left the rat on the grass. Now when the man saw her he would throw her the rats into her mouth.

Today no different only the man seemed troubled. Hegwig nipped his ear affectionately the action surprised the man.

" You know me girl?"

Hegwig looked up hoping for another treat, she was still hungry.

" I guess not, here you go"

The man threw a rat into the air and Hegwig took off quickly catching the rat in her claws. The terse laughter made their way up to Hegwig.

"You should have been a seeker." the man explained.

Hegwig then started her journey back home, and she knew that her return would make her master smile if only for a little bit of time.