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Ballistic Knife + Sickle. If you knife him in long series for 10-15 mins, he will die. Combine this with a friend Floppering, he dies faster.
Usually the guy with the ballistic should get the wunderwaffe, while the other guy has the upgraded AK74u, upgraded HK with the dead shot perk. Should get you round 45+
How is this his weakness... I could say his weakness is the standard knife because if you and your friends stab him for 30-40 minutes he will die!
It's quicker to kill him if you have two or three people PHD Flopping him than to knife him with anything, as far as we can tell his only real "weakness" is the "Scavenger" as it seems to kill him quicker than any other weapon but all weapons will kill him if you have enough time and enough ammo.
Shoot him when he's not in water. Take 1full upgraded scavenger and 1full ray gun and once ray gun when out just upgrad the ray gun. 2 more clips of ray gun. He's dead. Takes 5 mins Not even. Tips just run around a circle in the lighthouse keep shooting him.