This guide is for psychos. For killers. But it also makes You beat The Scientist faster. (works on every difficulty)

• Optain the screwdriver and wire cutters
• Enter the house, and then the basement
• Open the vent, kill the operative, fast. Otherwise, they'll see the open went, and raise the alarm
• Give Rivera the screwdriver, and wire cutters
• Get the screwdriver after Rivera opened the door
• Get to the control
• Don't hesitate, shoot em all
• Kill every single operative left, but be patient if Falcon, or others have the radios on, You'll need to answer them, if You kill em
• Go to heli with Rivera
• Eat donuts with Sparrow (optional)