Me and my nephew playing campaigne mode on multiplayer cant get any more frustrating as it did a few days ago. Halo is one of those games that are fun on campaine mode but can get annoying on free for all and co-op mode. It seems that yor friend kills ou more on co-op than on split screen. I dont blame your friend for throwing a grenade on an enemys face that you were chasing down. If you were planning on buying halo you should. I give it a 9.3 out of 10