Very, very nicely done, I like how Dementors are not cowed but enraged by the destruction from their number. As far a the sword, great scene but I hope for some sort of explaination next chapter on the bonding issue and the idea of having it as a focus: remember, aiming a wand at someone or something is a hell of a lot easier than doing it through a sword, but just using the sword as a point and shoot thing is kind of a cop-out imho. Still, great job, keep up the good work!