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This is a power up where upon if you activate it, you have a temporary shield of cover infront of you.
It is higher than Master Chiefs height which means you will always be in cover. However as it is shot, the shield will weaken and eventually it will be destroyed.
It is quite weak as it is quite easy to destroy but it does save you a few seconds to either run away via fleeing or recharge your energy and have another battle with your opponent.