Lol this guy..anyway.
-Iron Sand works as a shield that lets him defend from Ay's attacks.
-As Zexion noted above, the bracelets he wears are most likely made of some kind of metal, and we have seen the effect of magnet release being used on metal. [
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He can use this metal to magnetize Ay's body in so he'd be pretty much drawn to the Iron Sand, allowing him to finish it with one of those giant spikes. He'd get a scratch on Ay via
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. Since it covers a large AoE Ay would have trouble evading it completely, though he can tank it with ease....too bad that he'd still end up getting magnetized via his bracelet once the Iron Sand makes contact.
The Sand that covers the area due to the technique also helps in limiting Ay's movements, since Shunshin isn't helping when in
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. Surrounded by iron spikes that obstruct his path. This also lets him use Poison Gas on Ay while his movements are limited by the surrounding sand.