nightmare

This is a dream from a while back.
I was in a Nazi-like camp, except in the frame of the Harry Potter universe. Two of my closest friends were with me, as were two characters (Remus and Sirius) from a Harry Potter fanfic. One friend and I were pure bloods—we were put in the back, and treated well (mostly ignored). The half-bloods were in the middle; they were being yelled at and terrified, and uncertain of what would befall them. Remus was in trouble, because the Hitler figure (Umbridge?) found out that Remus was a werewolf and thus not a pure blood. The muggleborns were isolated in a separate chamber. They were forced to wear light blue uniforms, long stretchy shirts, with a symbol on them. They were also unable to walk fully upright—they were being controlled somehow so they couldn’t hold their heads up fully, and were oddly contorted. My other close friend was among them. I woke up as they were being led away. I was trying to figure out how to save her.