Most older games will have 2-3 engine loops that they will blend between and pitch accordingly, however Forza 5 specifically was the first in the series to use granular synthesis which is a much more modern approach.
These will have a series of sound files including all the different parts of the engine, exhaust, turbo, etc. Then the software slices these files into tons of pieces in real-time and plays the slices based on the players inputs.
It’s tricky to explain without examples, so here’s a video that does a decent job of explaining how it works in music: https://youtu.be/ftDLRYnRYZQ?si=SEHOl55K7rimi4Eu
You might want to X-post to c/relationshipadvice as well. That being said, the only one responsible for kidnapping anyone is the kidnappers. And no one should expect their friends or lover to kill their kidnappers. It would likely get you killed in the attempt. On top of this, these are all hypotheticals.
Someone who is using hypotheticals that they made up in their head against you is more worried about themselves than you.
It is not my place, but this person sounds like someone I wouldn’t even want to be friends with, let alone date. Friends are there to build each other up, not tear them down and add anxiety.