It can't be written clearer in the rules :
Leaving is not allowed when game status is 5v5, 4v5, or 4v4.
* Rule #1 applies regardless of what the situation in the game is and regardless of how short or how long the game has lasted. Even if you leave only a few seconds before the game ends, you will get banned!
It is not very hard to wait for some seconds, after all there were mega creeps to destroy the throne.
Denied.
