Please Patch this, I've restarted my game trying a bow instead of an SMG and Nothing fixes the fact that this overload won't be staggered Physically their health will stagger but thats it.
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If you want to get rid of him quickly, go to the platform under, freeze with duskfield nade, jump up, stun with whatever you have on hand, I use ikelos. And finally lament or guillotine will make quick work of him.