How do granted skills (with x% chance on attack) interact between themselves when you dual-wielding weapon?

Let’s say I have a character with two Morguul’s Mortality guns, so I have two 10% chance mortal coils, each give - 12 vitality resistance. Do I have two separate mortail coils with 10% chance? Does that give -24 vitality resistance? Or each one has separate 10% chance of activating but they don’t stack? Or I have 20% chance on attack?

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