This applies to both the single-player and multiplayer gaming experience. Say that you destroy a command and control center that disrupts communications across the Halo. You may see the effects of such an attack at a later point in the game. You will return to the base to find it still destroyed, not just magically repaired unless of course there is a good reason. The world itself will be persistent.
Dead things stay dead.
There aren t infinite bad guys . And when permanent objects in the world change, it will be for a reason. I wouldn t be surprised to find players using inferior weapons or vehicles just because they re so much fun to use. Inverse Kinematics is a branch of mathematics applied to complex motion. How it works in the context of a computer game is this.