Good start, here; gald to see you're well enough along to start posting this one. I'll be looking forard to further installments.
I like the action-packed introduction that pulls the reader in. Now, you need to establish the backstory prior to continuing the action. This is obviously a different HP/Green Lantern crossover since he uses a staff. I like his approach, though, to go bold and make quite the statement at the same time manages to definitely et back the Deeters.