Question: Stormcaller Arrow weapon switching: which Weapon Set passive skill points apply?

I am playing a Lightning Spear Amazon, and I was thinking of equipping a bow in my Weapon Set 2 to use Stormcaller Arrow to apply Lightning Exposure on bosses. I was thinking of taking extra shock chance nodes in my passive skill tree with my Weapon Set 2 skill points to make Stormcaller Arrow more likely to shock (and thus apply Lightning Exposure).

The thing, however, is that the first projectile Stormcaller Arrow fires isn't actually very good at applying shock. However, 1.5 seconds after the arrow hits its target, a lightning bolt with 500% more chance to shock is summoned. But by the point the lightning bolt hits, I would have already switched back to my spear in my Weapon Set 1.

So now the question is, do the Weapon Set 1 passive skill points apply to the lightning bolt because that is the currently active Weapon Set when the lightning bolt hits, or do the Weapon Set 2 passive skill points apply because they were the ones that were active when Stormcaller Arrow was used?