Oh hey! A new character! Cool! :sun

In terms of history, I reckon this would be the best fit from O'Malley's list:

"They saved you from another hunter who was prepared to kill you. Ask them what happened."

Oh and just to note, Silvio's history with O'Malley would have to be before Silvio left for Puerto Rico. O'Malley has only recently come back online after being shutdown in 2020 due to Covid, so they would not have been able to see each other in the past two years that Silvio has been back.