STUCK IN SACRED RESEVOIR!!

Now, during the Zahmir boss fight that you had to unlock. HE JUST DISAPPEARED! NOW I AM STUCK IN THE BOSS ARENA AND CANT LEAVE!. I tried to exit to character selection. Ive shut the game down, ive turned off my Xbox. But everytime i load back in, im still stuck in the arena. The only way out is death, but thats impossible if the boss is gone. Currently im in limbo jail in sacred reservoir. This is the 3rd bug in a week that has caused me not to want to play...please help!

On the character selection screen, you need to press the small house/home icon just to the right of the character name and opt to respawn in town/hideout.