Part of me is tempted to @ everyone who insisted that “assassin school for assassins” line was Vex being sarcastic or lying, to explain away that ridiculous moment.
Turns out, nope, she was telling the truth. That is canon in the comics. That is genuinely what Col/ville thinks her backstory is. No bear, no love for her mom or brother, but plenty of snark, and also she was a trained assassin for some reason.
But Trinket has been a thing! That she left behind! In the woods! To go into town! Like she did so many numerous times in those 30 minutes of every episode you need to watch to get every character down. Did you forget that extremely smart and well written line about needing to pick up a trinket from the woods? I guess his genius was just too subtle for you.