Yeah simple. The sentinels walk through the shield and deactivate the generator.
English
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Would it be safe to send soldiers in?
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Not human soldiers unless they have heavy protective gas masks. I will be bombarding with poisonous Tiberium as soon as the shield is shut off. This will make the entire are uninhabitable and it will continue to multiply until it becomes a Red Zone.
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I'll give them protective suits.
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Riggt after the sentinels? Yes.
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Once it's safe I'll send in biotic support.