Trifling Wind- Double Chance question

What exactly does it do? "Double Chance" seems to apply it rolls the % twice per attack, allowing two triggers per skill used. But then the description just makes it sound like it just fires the normal [up to 5] arrows on a trigger, but now two of them can hit the same target. Is it one of those options, both, or neither?

According to some preliminary testing by people on Basil, Double Chance makes it so that Trifling Whim will always fire two arrows on a single target (whereas normally, you'd only fire 1 on a single target.) I'm not sure what it's like on 2 targets, though I assume each target gets hit by two arrows. If you hit three targets, it looks like you hit two targets with 2 arrows, and the third with 1. And so on.

Google search has showed me what Basil says, but I never saw any hard proof. And unfortunately, videos of 183+ WA's are either bossing involve the attack speed of Song of Heavens or training where there are tons of Spiraling Vortex hits + splash damages to many mobs. If there were a video of a WA with that hyper point periodically using a lower level skill to a stationary boss, that'd be great. But normally...there are just too many arrows flying about to really count out attacks vs 50% proc rate and seeing if multiple arrows can hit one target and all that jazz.

Apparently Trifling Whim double chance, doubles the number of arrows when it activates, source: http;//orangemushroom.net/2015/06/23/kmst-ver-1-2-013-character-balancing-pt-4/ (replace ; with
My guess with this hyper, if trifling (1-5 arrows) activates one arrow (0.5 x 2 arrows), twice (0.5 x 0.5 x 4), thrice (0.5 x 0.5 x 0.5 x 5) cuz 5 is the max number of arrows from trifling wind. With storm bringer and
song of heaven, the total number of hits should be around 32.69525 which is similar to a mercedes [(0.75 x2) + 2] x 8.33 +1 = 30.155