While not designed to kill outright, the deep cuts, scars and marks that are left on the refugees are highly susceptible to infection due to the conditions in which they live. The concept of the Manhack is an example of the inhumane methods that the Combine use to control the populace. They are programmed with very little concept of self-preservation, careening off walls and through objects in their single-minded pursuit of their target. Their blades are powerful enough to cut and break through wooden obstacles, but not through stronger materials such as metal or concrete. Their spinning blades produce a high-pitched whirring sound, which is often an indicator of their proximity.
Manhacks are small anti-personnel devices that use razor-sharp propeller blades for both propulsion and attack.
