This is what happens when you let the mobs get out of control:
You can run for the entire time if you need to. Though, the screenshots above show exactly what happens when you do.
Poor gate... Brought back bad memories of robo.
We lost at the 2:00 mark. We were soo close, but unfortunately we had soo many spawns that if you even were to look at the huge mob you would've lagged. Gateguardian died of a lag-related incident, and well - we just followed.