Once you get there, approach to the shiny circle located on the building’s rooftop.
This will start a new cut-scene.
Grab such persons (B button) and use the bio-bombs on them (X button).
After “sending” a bio-bomb, just walk away and wait for the explosion (screen above).
It is worth noting that such actions do not trigger an alarm.
The most basic method is to destroy tanks with standard melee attacks (screen above).
I personally suggest destroying tanks with explosive barrels and other environment objects.
Eventually you have to destroy all four tanks, resulting in displaying a cut-scene with Dr. Archer.
My personal favorite is hammerfist, but tendrils should do good as well.
Defeating brawlers will result in Dr. Archer rejoining the fight.
Watch out also for objects thrown by her, but fortunately there should be no problems with that.
Do not get into a corner and consume every defeated brawler when possible.
Start attacking Dr. Archer again, watching out all the time and trying to dodge her powerful attacks.
Fight until her energy bar is almost empty.
Heller will automatically deal with Archer and gain the second special attack - Pack Leader.
To summon brawler pack you have to press X and A buttons at the same time.
Beasts will destroy the helicopter with no problems.
Hold left trigger and press X and A buttons at the same time.
After conversation with Guerra the game will unlock a new main mission titledFall from Grace.
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