I'm a little late but for reference; NPC attack mechanics have changed slightly since this mission was introduced, originally people would organise group attacks but now NPCs are lootable so there is an incentive to consistently attack. You can find a guide on attacking (& looting) NPCs here - https://www.torn.com/forums.php#/p=threads&f=61&t=16121398&b=0&a=0
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I also have to defeat duke. so if anyone gets to hit I'll join. Ive already died twice now.
You can't just take him down solo, you need to join a group attack (usually when duke goes from loot lv3 to lv4)
My intelligence and assholeness are complementary variables; their product is always larger than h/4pi and it's your choice on whether you should measure my intelligence or assholeness. Sadly, my wavefunction collapse is usually irreversible once you measure it.