Bugged Chayula's domain

Ok so I spent 200 chaos on Chayula's breachstone...entered the map..activated the breach to start the level...fought for about 30 seconds and the breach rescinded instead of expanding through the whole level. Now I am stuck with an empty level and no way to reach the boss. 1 enemy remaining i can't get to because I can't access the arena. Has this happened to anyone else? I feel like I got royally screwed.

Im still in the map

You have to kill faster and not skip any rares in Chayula than the easier ones. The timer ran out on you.