Kill the surviving Combines

You enter the Marotropolis Police force H.Q. and you see the police, secretaries, and other members in a frenzy to get things done. You make your way to one of the police captains.

"Your here to help us out?" He doesn't give you a choice. "Good! Apparantly some Combines, these really well-trained soldiers, are still alive. They're the ones behind the Headcrab invasion event. We want you to go assasinate one or two of them before they make another move.

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Quest: Go hunt down the combines. You must face 20 headcrabs and 10 headcrab zombies before you face eacg combine. You can kill more than one combine. Also, you have to face each combine 1vs1.
Reward: 1Combine: Speed Ring, 50gold, 60exp
2Combines: Speed Ring, 100gold, 120exp
3Combines: Magic Stamina Ring, Speed Ring, 400gold, 440exp
(Max is 3 combines. And you can only do one of the 3 options. So it's go all out, or put a little effort into it.)
Lvl Requirement: 1

After your quest:

Spoiler: