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Halo 2's and halo 3's gravemind

OP OptimumCactus73

Yesterday I was playing halo 2 anniversary and a thought came to me that when gravemind allied with us(masterchief and arbiter in halo 2 ), flood were still our enemy. And when gravemind allied with us in halo 3 (just for killing truth and to stop activation of halo) then flood was in alliance with us ......... Think about it why not in halo 2 if in halo 3
Master chief is flood infected, dun dun dun!
Well Gravemind only exists in cut scenes. You never were able to fight gravemind directly but in a way that portrays him more powerful than anything you have faced. You can't just take a Spartan laser or a scorpion tank and blow up Gravemind as if it were some sort of mutated covenant scarab. But as for Gravemind his diplomacy were always the briefest of alliances. In 3 was the only time where the flood was not a swarm of red blips on the motion tracker. He was only an ally for a cut scène maybe two levels as the flood doesn't show up again until the 2nd to the last level.
He allied with the Chief and Arbiter in both games. The difference I see with both "alliances" was the time frame. In H2, we still had time to "stop the key from turning", so he didn't need to take much of an active role in the alliance. He just sent them off to do what they needed to do, and once they did it, he was back in the enemy column. And this is seen in the fact that the Flood don't start attacking Chief until much further along in the game than their meeting with the Gravemind. But in H3, it was far more urgent. He needed to take an active role to prevent Truth from firing all the rings in the next few minutes. Without his active participation, Truth would have succeeded.

EDIT: this might be better for the General Discussion Forum section
In Halo 2 his alliance was temporary as his intended vector always was In Amber Clad and by having a perfect opportunity to slip space directly into High Charity he could infect more hosts to therefore eventually infect High Charity, where the index was.

However his plan wasn’t fully successful as the Index was taken away from High Charity and so he was hoping that the Arbiter would stop the key from turning after revealing the truth of the ring’s intent and purpose, which turned out to be a gamble that payed off.

Now to talk about Halo 3. The Gravemind needed to assist 117 and the Arbiter because they were not going to get to the control platform in time as there were so many Brutes, Jackals and Grunts. So the Gravemind took control of his forces, in particular the Juggernauts, which were a big help to get Chief and Arbiter to halt the firing if the Halo array (minus Installation-04 or Alpha Halo).

I also believe this would be better suited towards the general discussion topic as it is not a lore or universe related question/forum post.
Not really sure whathat you're asking about, but the term for when an enemy allies with you to fight another. is called an alliance of convenience.
Yesterday I was playing halo 2 anniversary and a thought came to me that when gravemind allied with us(masterchief and arbiter in halo 2 ), flood were still our enemy. And when gravemind allied with us in halo 3 (just for killing truth and to stop activation of halo) then flood was in alliance with us ......... Think about it why not in halo 2 if in halo 3
It's the same hive mind. A gravemind is the central intelligence. During the course of the game, he wanted us to complete their goals, but when we fulfilled our purpose, he betrayed us to try to assimilate the chief. All the data and raw strength at his disposal... it would've been very appealing.
In Halo 2 the Gravemind needed the Arbiter and Chief to stop the Brutes from activating Delta Halo. He sent Chief to one likely place where the index could be, and the Arbiter was sent to another.

The Flood never attack the Arbiter. Not once. The Flood attack High Charity after the prophets of Truth and Mercy broadcast themselves holding the Index. When Chief is translocated into the council chambers on High Charity, and the Covenant hierarchs begin to panic, the Gravemind crashes into High Charity, and attempts to intercept the prophets and the index to achieve his own goals.

Once the Gravemind realizes that the Index has already left High Charity en route to the control room, the Gravemind shifts his focus on converting High Charity and its surviving population into a Flood hive. At that point the Chief is simply no longer of use alive so he is attacked.
In HALO 2 it was more like blackmail in that the Gravemind was threatening the chief & arbiter to do what he needed so he could later betray them, which he does, but not because things went his way, but because Chief just did what benefited humanity. In HALO 3 the gravemind teams up because he knows it’s the floods last chance to stop the ring, and takes the risk