kicked out in assassin game

Hy dear CC moderators...
My target in an assassin game was kicked out (5302978). But I destroyed what was his territories before he was kicked out and nothing happened... I just want to know why I didn't win the game, and what are the rules about that problem in general...
Thx!
Zihileyeed
My target in an assassin game was kicked out (5302978). But I destroyed what was his territories before he was kicked out and nothing happened... I just want to know why I didn't win the game, and what are the rules about that problem in general...

Thx!
Zihileyeed