Great end to last game

I'm playing shyvana, and i dive the enemy kat and jhin in their mid inhibitor turret. All the while I'm thinking, fuck I'm dead. I see my health bar drop and then all of a sudden it comes up with me saying Quadra kill, and then the thresh walked right into me and I got a pentakill and then finished the game. What the hell did I do to get that Quadra? I should have been dead.