How exactly does Hwoj Wrap work with Bane of the Trapped?

As I understand it Locust Swarm snapshots on cast, meaning it takes your stats and buffs at the time of cast and will not update new changes until the next cast.
If I have a Hwoj Wrap, this makes my Locust Swarm slow enemies.
If I have Bane of the Trapped I do bonus damage to enemies that are crowd controlled. This includes slow effects.
If I cast Locust Swarm while wearing Hwoj Wrap and Bane of the Trapped, does this initial cast apply the Bane of the Trapped's extra damage or would I have to cast Locust Swarm twice, once to apply the slow, and then again to snapshot the extra damage the slow grants?
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Bane of the Trapped \u0026 Hwoj Wrap Test
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