[Nexus Siege] Winning without destroying Nexus

I just had a game of nexus siege where none of the two teams managed to destroy the enemy nexus in the given time We were the first team to attack the enemy Nexus and had to defend in the second one. After tehy werent able to destroy our nexus we won the game and nobody had a clue why. IIrc both teams destroyed an equal amount of towers (only 2 nexus towers remaining) and we were behind in total kills 62-82 or sth around that does anybody have a clue why we won the game?
Report as:
Offensive Spam Harassment Incorrect Board