A small noise of approval follows Izuku's eventual agreement to Kido, because it's both tactically sound and appeases him as a shinki with a recklessly selfless god. But he's thinking about it, mulling over the plan and their cards, before he answers.

"Ice and fire." He makes sure to tack fire on second, putting a highlight on the ice aspect for Kido's sake. Besides, fire in an enclosed space wouldn't be their best bet. Especially on the Near Shore. "We could probably trap the ayakashi in with ice, if I'm right. It would also make it so Kido's power would be localized, and hopefully keep others from being drawn in."