I also understood this like you. He tried to open the safe but was unsuccessful as Rusty changed the combination.Didn't rusty change the code? Only Tommy, Rusty and MC should know it, if Vinny opened that safe, it means he is connected in the camera/spying stuff and the entire mansion is bugged...or Tommy somehow snitched. But to me, more from the sound effect used, seemed that he tried to open it but he couldn't.
How do you understand what Quinn says to the MC at the end of the party?
The MC explains what happened with Vinny, and there Quinn asks him if he really knows how to fight. After the MC's answer, she goes straight on and asks him to accompany her somewhere. The MC thinks she's talking about a date.
I don't know if Quinn's question about the MC's fighting abilities is about Vinny or if it's because she needs a bodyguard for what the MC thinks is a date?