The side arms main trait, that states, that reloading after a kill you will get invisibility for a short time. In most cases this is true but specifically where I have noticed it is bugged and won’t work at all. Is when I fight the fallen exploding shanks, which for what ever reason that is unknown to me. Will not activate the Rat Kings trait “Vermin”
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Read the perk again, you have to reload after a kill.