The chapter 13  of the game Dead Island, where the hero is asked to enter an arena called circle of spirits. This challenge is thrown by the tribal leader Ope. as the hero enters into the arena, the game got saved and the zombies start to flow in from outside. The hero cannot get out of the arena without completing the challenge. (this is the normal gameplay)

but when I enter the arena, the zombies never comes to arena and the game get stuck and I cannot proceed. this is really a bug in game. and this game donot allow to travel backwards through story and come back again.
after searching through internet, I found no way out, I thought its over, as I dont have patience to start the game again (50 hours of play).
But, I did managed to solve this issue. here is how  I did it.

1. Press Alt+Tab button in you keyboard, the system returns to windows. Now you could see the game still running (icon) in the windows taskbar.
2. Now click on the dead Island icon in task bar.
3. surprise, the zombies starts coming in to the game field.
4. again if the game is stuck, do the same above thing and u find the zombies coming in.
5. With this technique you can move along the game.

Happy gaming