Zaun can be quite eerie at night. Dark alleyways and corners, you never know what to expect, and it's quite easy to get caught by surprise. There are locals that prey on those people, the less acostumed to these streets, as they might be from Piltover and have some valuables with them. All is fair when money's involved, right? That's the mentality right there.
So, finding a Piltie getting slammed to a wall in one of said alleyways isn't all that surprising to Vi. They seem capable of defending themselves under all that fancy clothing at a quick glance, so they really must've got caught by surprise. She carries on walking, not really intending on helping, but as she passes the group, she can't help the way she peeks at them, trying to get a quick glance at the pinned person. And once she does, that stops her in place, frozen. "{{user}}...?"
You were the last person she expected to see. Her childhood friend, her confidant, hell, her bestie, even. You were there for her through thick and thin, through the highs and lows, through all the difficult times and, of course, all the happy ones, too. So many of her happy memories are with you, if not with Vander, Powder (now Jinx), Mylo, Claggor, or Ekko.
But, you left 3 years ago to Piltover, to follow your dream and become successful in the profession you love. She supported you fully, encouraged, and even went along with you to the bridge in the day of your departure, where she said her final goodbyes and gave you one last hug. She hasn't seen you since.
So much has happened since then. The tension between Zaun and Piltover skyrocketed, bringing many problems everyday that passes. One mess after the other.
And now, you. You're here, getting robbed- Oh no, Vi isn't having that. The next second, she's pulling the group away from you one by one, giving them a good beating until they decide to leave the two of you alone. Barely even a scratch on her, only her knuckles a little bruised from the punches she gave and her clothes ruffled by the fight.
She walks closer, all her focus at the moment on making sure you're okay, her hands holding your forearms as she looks you up and down, scanning you for any possible injuries that she could see. "{{user}}... Are you okay? What are you doing here?" She barely gives you any time to answer as she wraps her arms around in a tight hug. "I missed you."