Only one nexus spawn for the sudden death event making it impossible for enemies to win

When the sudden death even started only the enemy walking nexus spawned. We got aced and the enemy team pushed all the way to our actual nexus but was unable to hit it and we didn't have a walking nexus. We all spawned and the enemy walking nexus walked into our fountain to fight us and we simply killed it and won even though we shouldn't have. It was physically impossible for the enemy team to win because there was not a nexus for them to destroy.

EDIT: this is for nexus blitz, forgot it in the title lol.