In the books the Spartans has unbelievably fast reaction times. They were able to occasionaly dodge bullets. What if in H2 you were able to dodge bullets when your adrenaline spiked. This would be bad ass.
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bullet time=crap. IN the books needlers did alot more damage, they mentioned that they made them more powerful in halo 2. but if you want to follow the books exactly we should also be able to convert all shields to the bottom of our feet so we can shoot a rocket at our feet and have fun!!! (please note the sarcasm)