Sirius found Peter in the middle of a Muggle street. There were Muggles all around, already turning to look at the man sprinting through their midst. This was a blatant breach of the International Statute of Secrecy, but he found that he didn't care in the slightest. He was so far past caring that he barely even registered that there were Muggles around. They could be Obliviated, they could die for all he cared, he had to kill Peter, Peter had to die, Peter was going to die for this -