Sirius catches Petigrew
"PETER!" The short plump man ran down the street it was dark and raining the ground was wet Petigrew was soaking he could barely see but it was hard to miss a big black dog bounding down the street chasing him yellow eyes focused on his prey. Now Muggles aren't stupid, if a man in striped pyjamas is been chased by a big furocious dog, they're simply going to notice but it's not like they could help.
The big black dog jumped to tackle him. Peter had his wand out but he couldn't think of a spell he was tackled his wand flew out of his hand. The man fell hitting his head, his eyes were foggy water falling in them. You don't need to see you can just feel anger that big. Hot breath making it hard to breath.
"Sirius please!" the dog was gone replaced by a very angry wizard kneeling on his chest. Leaning down there faces inches from each other.
"You betrayed them!" he didn't shout which made it worse Peter understood anger his master yelled at him, but Sirius didn't yell he did something worse than show ange he showed fury absolute and true. The Muggles stood in the street watching them, medophorically but not magically petra phide.
"HELP!" he cried "someone give me that stick!" Sirius pointed his wand at the wand, his hand holding him down. A barrier appeared around the wand.
"I am going to kill you and... No, no the kiss would be so much better for you!" Now it didn't happen to anyone else but if you asked Petigrew the temperature dropped to -20 degrees and the the ground fell.
"Not the Dementors please!" he quivered in fear.
"I admit your soul will probably make them sick but worth the risk!"
Sirius smiled, removed the barrier grabbed Peter's wand pointed it at him and with his other hand said Expecto Patronum made it talk and sent the Ministry this message.
'I have the traitor of the Potters send Aurors immediately.'
"Too bad your master's gone he was your only hope"
The Aurors aperated 2 minutes later. They held them both. And interrogated both of them.