[ Meanwhile, Shouto opens up a neon yellow glow stick, dips his finger in its contents, and paints an 'x' to mark where he's been. He makes sure to use all the liquid on his finger before closing the glow stick back up and setting it back in its metal container where he has three more tucked away as part of his cave exploring kit after Megumi used a similar idea to track their whereabouts in the caverns below. When he's done, his left hand ignites into a glowing red flame before crouching down at the edge of the river to check it for anything suspicious. ]

There's no fish in the river.

[ He calls out before using his ice to reach the glowing ceiling and get a better look at the-- ]

Oh. They're worms.

[ Bioluminescent glow worms. He reaches out to touch one of the long threads hanging down, not realizing that they're made of urine the glow-worm vomited out. ]

The threads are sticky but they don't seem dangerous. Some bugs are stuck in some of them. Probably the food source for the worms.

[ He lowers himself down on the ice, touching down and setting a left hand to melt it. In the process, he removes any of the sticky material still on his hand. When he's done, the ice reduced to nothing, he turns back to Touya. ]

Are you coming too?

[ Meaning, he's most definitely coming down this way. Touya can join him if he wants. ]