Hmmm. I'm not sure on what the goal of this is. It feels short, and it doesn't have enough of a narrative for a typical WL story. I recommend expanding a lot more (continue the story of J and what happens next) and rereading for grammar errors.
As far as what's here, there isn't a lot of description, or at least sufficient description to give a good picture of the cavern.
a large cavern with a fighting cage in the center and seating all the way around it.
How do the interior walls of the cavern look? Smooth, blue, red, rough? Describe the cage as well: What material is it made out of? How large is it? The situation of the seating also needs more detail—Is everyone able to sit? Is the cavern packed?
I like the potential this idea has, but I feel like the story you have so far doesn't do it justice. What are your plans for further writing (what would you put in the other chapters/how would you expand chapter one)?