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Originally Posted by JRoy
yeah true..i saw that today..i liked it all till that last 30 mins too...how the damn birds confused um and the army guys shot at um..soo damn confusing....

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The birds on the machines meant the Shields were down. that's why they shot at the ship.
The veins, the aliens survived off of our death, they started to weaken when they had less blood to survive on, thus the sheilds went down.