User blog comment:Croc117/Deadly Duo:Nathan Hale & Joseph Capelli Vs. Master Chief & The Arbiter/@comment-422690-20101221202848/@comment-181289-20101222065934

But regardless of of what ever vulnerabilities there armor may appear to have, there shields still stop even head shots and after going through that there the actual physical armor. Additional Spartans and I think Elites actually do have a for a limited regeneration. The amount of Damage Spartan alone is capable of sustaining, (Like falling through the Earths Atmosphere) is ludicrous. While the Pure Chimera hand were devastating to unshielded Chimera, I really don't think that's the same as as the Energy shields used by Spartans and Elites. Chief and the Arbiter have 3 levels of defense before they can be hurt, Capelli and Hale have the Regeneration which while useful if they can get to cover, doesn't help with a grenade exploding right on them, if a piece of Shrapnel go's into there head, there done.

The Arbiter was Part of the Covenant but the Covenant split, the Elites against the Prophets and Brutes. That's why he fought alongside master chief.

I will coincide you're invasion point however, it rings true.