Right after you first get it, you are told to go to the lighthouse. Enter the car and make a save.

Shortly, while you drive to the mission objective, you will find a group of 4 mutants.


Right after, at the first intersection, depending on your timing, there will be a 2nd group of 4 mutants right in front of you, or on the road leading to the right.






30 seconds~ could get you 8 kills.
Repeat until it pops.

PRO TIP: If you already finished the game or just passed this act of the story, you can go to chapter select and play 5 minutes from the beginning of Caspian level and reach this spot.