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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This is a spawn bug problem. It's come around because the platform he's stood on is not large enough to remove his spawn protection. My suggestion is of two approaches. Le Monarque and a Rocket with Lasting Impression. OR A different bow with Lament. Both have solved the troublemaker for me in the past. Again it's a spawn bug due to bad construction of the lost sector in this section. Keep at it.