Li Feng could do nothing about Peter Pettigrew. He was no political big shot who could have the Ministry of Magic throw Peter Pettigrew straight into Azkaban.
What, was he supposed to approach the Ministry of Magic as a Mage from another universe, hold some sort of business meeting, and demand that they severely punish Peter Pettigrew?
Never mind whether the Ministry of Magic would believe him. Once they learned Li Feng's apparent identity, what would they do? Either lock him in a madhouse, or answer his questions with a massive bottle of Veritaserum. If they confirmed that Li Feng came from another world, they would probably hit him with an Obliviate afterward, then smile as they dissected him for research before announcing to the wizarding world, "A new world, a new frontier—we're coming."
Lupin knew Li Feng was powerless in this matter too. He had merely clung to a sliver of hope that he might learn Peter Pettigrew's fate. Seeing that Li Feng would not answer, Lupin did not press further. Otherwise, if he pushed too hard, Li Feng might start talking about another deal. Lupin had been so poor that he had not bought new clothes in years and had to live under Sirius's roof. Where would he get the Galleons to ask questions? He would be better off being careful when capturing Peter Pettigrew and finding solid evidence.
Thus, Li Feng's miserable life officially began. During the day, he learned how to modify cars from Lupin; at night, he still learned the fundamentals of magic from Lupin. On Saturdays, Lupin could pat his backside and declare that he was taking the day off, while Li Feng still had to keep studying, dumping all the questions he had accumulated over the week onto Dumbledore.
It could be said