Not necessary a killing quote
Ezreal suviving Ace in The Hole
"Totally no skills there Cait."
"Chance of a headshot: zero percent."
While using Ace in the Hole with Ezreal nearby
"Sure we hit something this time"
"If they run in to the bush I will make sure they don't escape!"
Caitlyn taunts Ezreal
"Oh look, I all about skill. Charming little boy"
"You can't even hit the broad side of a pyramid let alone me"
Caitlyn taunts Jayce
"Jack of all trades, master of none."
"Is that hammer compensating for something?"