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I have already unlocked the Heavy Beatdown skill in 'The Shark' skill tree. The lock is removed but it is unusable and has no effect when I double click it. I have 1500 xp out of 4000.

What should I do to use the Heavy Beatdown skill in 'The Shark' skill tree?

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Are you sure you've unlocked the skills adjacent to it? Sometime before you you can unlock a skill, you need to unlock a previous one – JohnoBoy Mar 24 '13 at 20:00
Can you provide a picture / screenshot ? – Zero Stack Mar 24 '13 at 21:47

You must unlock the skill adjacent to it (Grenade Takedown, which requires 5 kills with grenades) and kill one Bull Shark (Heavy Beatdown skill requirement), before you can get the Heavy Beatdown skill.

Tips for killing bull sharks include running them over with a boat or use a boat with a mounted machine gun and blast them with it.

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