Local impale chance should not apply per hand for skills like Dual Strike

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• I'm running the latest version of Path of Building and I've verified this by checking the changelog

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What platform are you running Path of Building on?

Windows

What is the value from the calculation in-game?

Impale is an on-hit effect that isn't part of damage calculation; it occurs after skills like Dual Strike have combined their damage from both hands. The combined hit receives local impale chance from both weapons, unlike local chance to poison or bleed.

With 60% global impale chance and 20% local impale chance on both weapons, Dual Strike has 100% chance to impale. Here's a (painful) demonstration of that setup successfully impaling for 270 consecutive hits, which makes it vanishingly unlikely for the chance to be 80% (or even 96%).

(Mechanically, the same applies to other local chance stats for on-hit debuffs that aren't damaging ailments, such as Maim or Blind, but those two are currently not implemented in PoB.)

What is the value from the calculation in Path of Building?

Skills that combine damage from both hands do not combine impale chance from both hands.

This affects all skills that combine damage and can be used while dual wielding.

How to reproduce the issue

1. Add Dual Strike
2. Add Impale Support
3. Add a sword with the local impale chance benchcraft, slide it to 20%, and equip it in both hands
4. Observe that each hand calculates impale damage with 80% chance to impale (and that additional impale chance still raises impale DPS)

PoB for PoE1 build code

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Empieza por localizar el cálculo de la probabilidad de Impale y el tratamiento de las habilidades que combinan el daño de ambas manos, y después reproduce el problema con la configuración de Dual Strike descrita anteriormente. Se considera terminado cuando las habilidades de impacto combinado utilizan la probabilidad de Impale local de ambas armas equipadas y el daño de Impale mostrado coincide con el comportamiento dentro del juego.