Halo Tips

Freeze/fight Elite earlier
First, go to the first mission and do everything you need to in Campaign. When you go into the maintennence hall with the Elite fighting the two Marines, run in and go left through the two doors that the Elite would go through if you stood there. Go all the way back and stay there, he will fight the Marines and never die, nor will they. You can get hurt if you go too close, but its fun to hear what the guys say about getting shot at. When you get bored of watching the Elite and Marines bleed over the hallway and adjoining one, go forward until the checkpoint comes up, the Elite will freeze, because he's not supposed to be there, but the Marines will not.