Strange schools

So this one happened in two parts that kinda sorta matched.
I was walking around an arena of sorts and there were fighters down in the middle. I knew one was defending me for someting and the other was trying to get me killed. I don't think I figured out what really happened although I know I didn't do it. The arena sort of reminded me of high school. I remember adjusting my skirt and then walking to a small room where food was stored/sold- it was remincenet of a concession stand, but it wasn't. I ended up talking to a boy at the counter for a moment and then turned my head to talk to a girlfriend that had showed up. The poor boy had been drinking water all day and for some reason we thought that a rival had poisioned the water making him have to go really really badly. Unfortunatley, he went behind the counter, and couldn't stop. He tried to move around the counter and ended up facing a corner between the wall and a soda machine and still couldn't stop. At that point I got hit with a water spray across the chest- one that I could feel and remember feeling. At this point I figured I better change because it was getting close to the end of the match and I was told to get to arena. So I changed from my wet top and skirt to this sort of white dress (that felt like mourning) with black and red ribbons that were woven together around the top. By the time I got down there it was almost over, but I couldn't see either fighter and I felt someone come up behind me and grab both my wrists.

The second part took place in a house that functioned more like a school. One room was lit and had those desks I remember using as a grade-schooler. I was sitting there with a couple other girls getting ready for something when the girl on my left pulled out this big hamster eraser. I ended up playing with that for a few moments. The teacher didnt' show up and the next thing I know is we were chasing the boys from the class outside and we wanted to do whatever they were doing- which seemed to be knife play and tracking, and playing in the dirt. They kept telling us that it was all hard work and no, we wouldn't have any fun. I remember yelling back at them that they were lying and that house work was no fun. And as we were racing up this hill I remember changing shape in to a silvery canine, saying I could keep up as I managed to by-pass most of them, digging into that hillside. The next thing I know is I'm human again and together with a group of kids in front of the house we are milling around almost with a nervous energy. Runaway is what I kept hearing- were we to run away or were we to chase after a runaway?