Vi and Caitlyn Special Interactions

Vi has several secret interactions with Caitlyn.

Allied Caitlyn:

Each gains the cosmetic buff, "On The Case: Piltover's Finest".
Each gains +1 movement speed while near one another.
Each gains +1 bonus gold if both of them participate in a kill.
Three unique phrases in response to an allied Ace in the Hole.

Enemy Caitlyn:

If Vi taunts while near an enemy Caitlyn, she will perform one of two special taunts. Doing so gives a cosmetic debuff to Caitlyn called "Agitated: How Agitating", which remains until Caitlyn damages Vi or Caitlyn dies.
Three unique phrases in response to an enemy Ace in the Hole which hits Vi, but does not kill her.