You must consume the elite Blackwatch soldier, as shown on the above screen.
It is best to look for such individuals near bases and checkpoints.
Stand in the circle which results in displaying a cut-scene.
You have to reach a shiny circle, located on the building’s rooftop, behind large billboard.
Once you get to the rooftop, I suggest carefully consuming Blackwatch soldiers one by one.
Good news is that scientists can’t flee anywhere.
Do not care about main objective for now, but focus on completing the bonus one.
Start with approaching in disguise to one of the tanks.
Jump onto the vehicle and take control over it (B button).
Destroying hostile vehicle with the tank controlled by you will result in completing the bonus objective.
Depending on your preferences, you could keep moving inside the tank or use other Heller’s abilities.
Regardless of your choices, watch out for helicopters and super soldiers, trying not to fight them.
Keep destroying tanks until you receive information, that you’ve destroyed Riley’s vehicle.
Fortunately he won’t stand long.
The game will automatically unlock an access to next main mission titlesA Maze of Blood.
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