Halo 2: Petey Piranha's really let himself go

I've got hold of another copy of this - my fourth in total - and carried on from where I left off, even seeing the cutscene.

Back to controlling the Arbiter, I was instructed to go and retrieve the 'index', which is basically the ignition key for the halo system. This was, of course, hidden within the halo, protected by loads of automatic sentries and big enforcer things. These were both a blessing and a curse, since they destroyed the flood (or the flood destroyed them), and if I waited around I'd only have one set of enemies to contest with. But the enforcers were a pain, covered by a massive shield in front and lots of firepower. In the end I generally destroyed them by activating invisibility, running behind them and throwing sticky grenades at them - though in a couple of cases there were handy rocket launchers laying around.

I was a bit worried with the constant references to "the library" in the in-game dialogue, but luckily there were no long repetitive corridors to fight along ... there were lots of big open areas, with the flood controlling vehicles, and some big firefights with allies. Great fun. At one point I got on a big lift thing, and had to run around killing the flood who jumped onto it - mainly by making myself invisible, running up to the group and throwing a grenade into their midst.

In the end, I got to the sacred icon - the index - only to find that Captain Keyes was there first. A cutscene showed her and Sergeant Johnson being captured along with the index, and then a brute came and took them off the Arbiter. It seems that the elites have been demoted - and have been ordered killed. The arbiter falls to his death ...

... or not. Previously, I'd seen Master Chief falling through the water after Regret's temple was destroyed. he was grabbed by a big tentacle thing. The same catches the Arbiter, and reveals how halo will destroy everything in the galaxy - he's the parasite, the father of the flood. He looks like a big toxic version of Petey Piranha. We need to get hold of the index.

Master Chief is warped into the middle of the prophets' meeting. Oops. Somehow almost everyone disappears and I ended up having to fight just a few brutes and jackals. The elites are now a third party ... as I found out when I got outside and found them in combat with the brutes. Whichever party is left then tries to kill me. Charming.

I went and rescued some captured marines, and then worked through fights between elites and brutes, and even fought two hunters with very little ammo. I'm now on a floating platform with hovering elites killing me constantly. I think I need a break ...