...Drone, Grunts, Elites, Jackals, Hunters, Brutes, and prophets are all different races. They form a deal that has all of them in it. In a way, they are the same race, in a way they aren't.
The sentinels aren't a race, they're a machine, built by the forunners.
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by the way I asked this a long time ago did anyone realize that in halo 1 hunter's bleed flood blood and sometimes even master chief does?
...HUnters bleed bright orange blood. I don't see how you can confuse that with the gray/brown/green blood of the flood.

Maybe a glitch may have messed it up, or they were covered with infection forms?
Also, Yoshi, make a cache of weapons, so you have alot of fire power at your disposal. If you wait too long the guns dissapear, in the end you can have about 20-30 guns at your siposal. That's the non cheap way. The cheap way, you push a box just close enough to a stationary gun that you can use it and be covered by the box. THen you can fire from it and not get hit

Hope that helps