The Oneironaut's Odyssey

Dream
It was day time on a school trip, there was a group of us and something about a killer on the loose. He was apparently after us and more specifically, me. We were on a bus at one point and I remember seeing other kids on another bus, they were in the same group or something as the killer and are his accomplices. Wait, so the killer is a kid?
I'm in a building now, it's the hotel or whatever that the class is staying at. I'm sitting at a desk and I'm Malcolm from Malcolm in the Middle. I had earned money from doing something (I think selling notes for class) and bought a gun for self protection. It's night time here and the gun is in front of me on the desk under the light of a small lamp, then the killer shows up. I can't remember how but I shot at the killer which was lucky because he had a gun too. But it's surprising because the killer is actually Aaron, a childhood best friend. I remember getting a scolding from the teacher (I mean after all, I'm like 10 in this dream and I have a gun..), later on I end up with my gun again but this time there's modifications. Oh sweet modern technology for being so damn cool. This part was really vivid and awesome, I added heaps of attachments to the gun I had, turning it into a full on rifle. There's a firing range which I shoot at twice, jesus that's powerful. I fiddle around with the rifle and dismantle bits and pieces before reassembling it, there are lots of details here that I can't write up. I'm in my room again and I have the gun... Wait, what was that? I swear that I heard something but it was just so faint.. I raise my gun slightly and then as if he was just going to peek around the corner, I see the killed (Aaron) poke his head through my door.
*BOOM* I have a sort of panic moment where I let loose a couple bullets in his direction, he's stunned that he didn't get the jump on me and that I have a huge ****ing gun. He ends up getting apprehended in the end..

I also remember something about a killer except this time he has a square upper arm scabbard which has a dagger sheathed in it. He jumped out in a comic-book fashion with lines of effect whizzing past him while he drew his weapon and prepared to stabby stab..