On halo 2, ive figured out what the deal is with why you cant kill an enemy that is using a turret by whacking them in the back. The reason is that they are not really there. It sounds weird, i know. but it is true! I had permanent camo on cario station and was trying to get a white elite off of a turret so i could get him to pull out his energy sword. I was whacking him and all, but he wouldnt come off. and when i tried to whack him at one point, i went through him! Then i just kept on walking strait through him and wondered if it always happens, so i go over to some grunts on turrets and i can walk through them as well. So that proves it. I have also found something cool on quarentine zone. you know how on metropolis you can get a ride from a pelican and then after a minute it kicks you out and you can walk up to it and it will say 'press X to flip the banshee'. I found something like that on quarentine zone, except you dont get a ride from a phantom. You know that part where you come to a big circular area that is pretty much outside and one of those big machine things is there. It is in the area right after that where there are about 3 or 4 wraiths. (Note: you need sputnik skull for this to work) what you do is go and try to get on top of the wall-mountainside-thing on the right side somewhere. when you get on top of that, head as far right as you can until you hit the edge of the level where it just turns blank. go left and walk along that edge of the level. sooner or later you will see a phantom halfway in the ground pointing strait up. walk up to it and it will say on the screen 'press X to flip the banshee'. now you can have some fun with it and get major air off of it. I think i am the first one to discover this cause i have not found it ANYWHERE on the internet. *I feel special now*