The hunt for that alien, Zola, was left to Nova. Whether based on Roman Dey's account or the alien's species, it was clear that his individual combat ability was limited. Otherwise, Roman Dey would not have believed that Richard, a high school student without sufficient training, could defeat him.
So this matter had little to do with Peter and the others. However, they still had a problem to face: what were they supposed to do after catching him? Strictly speaking, the guy had hidden on Earth without causing any crisis. The only reason they could arrest him was because of Richard Rider's status as the heir to the Nova Centurion, but Earth had not signed any extradition treaty with Xandar.
They could not even contact the Xandarians.
Fortunately, although humanity had yet to truly enter the interstellar age, they did know some interstellar friends. When the Guardians of the Galaxy left, they had left behind a pager to call them. The Heavenly Sword Bureau now kept it, and they had already contacted the Guardians of the Galaxy.
When the time came, the Nova Centurion's body, the remaining spaceship, and the wanted criminal could all be handed over to them and taken back to Xandar.
However, upon hearing the name Guardians of the Galaxy, Roman Dey, this highly decorated Centurion, wore a very strange expression. Peter clearly noticed it. "Do you know them? That group led by Peter Quill?"
"How could I not? The illegitimate son of the Spartax Empire's emperor ran off to become a thief, and what he stole was an Infinity Stone. It was fortunate that nothing happened in the end, and he did lead that rabble in saving the entire galaxy. Otherwise, we would have been the first to arrest him."
Though he said that, Roman Dey