For about a second and a half except this place over here was two seconds...

"Longer delay on this one," he comments.

If he taps that and some of the ones around it do they vary in delay?

...one of them does.

"Maybe we should be looking for the longest lasting pattern since it looks like the time varies –" He demonstrates, if it wasn't clear before.

"Oh okay so if we try this..." And he starts touching one carving after the other, only the ones known to be longer-lasting. Which causes them to last even longer!

Anthony helps try to continue the pattern.

And soon enough the shape of a seven-pointed star, previously obscured by the squiggles and interesting carvings, becomes visible in light, and the door starts sliding open noisily.

"Woo!" says Anthony, apparently sincerely.

"Why is it a star?" Dayo asks. Kel shrugs.

    The revealed passage, in contrast with the previous corridors, is dark—supernaturally so—but broad, and the way their breathing and voices echoes suggests a rather cavernous space up ahead. "Hold on," says Kel, and turns his phone's lantern on. The broadness is misleading: the path they can actually walk on is only wide enough for a single person, and the space to either side of it consists of a pit deep enough that the bottom isn't visible. "The deadly starts here," Kel adds.

Anthony hesitates.

"How much of the deadly do you have traced out? Or – is there anything interesting, in the parts we can get to relatively safely?"

"The interesting parts there is the deadliness itself. It gets pretty creative. We've mapped out a ways farther into it."

"And," he starts, still hesitating some, "… it's relatively safe since you know where the deadliness is?"

"Yep."

He pulls a bit of a face, weighing it up.

"What do you think?" he asks, turning to Dayo.

"Have you met me? I'm all for it let's go."

    Kel grins.

Anthony hesitates some more, but only momentarily, before he makes up his mind.

He nods and continues forward.

"Follow me closely," Kel says. "The bottomless pit isn't instantly deadly but try not to fall."

There is in fact enough space that they don't need to really balance—so long as they're not the type to suffer from vertigo when looking at incredibly deep and menacing and dark falls.

Anthony peers over the edge, carefully. The sight seems to disagree with him, making him pull back and keep his eyes instead on the path ahead.

"And maybe don't look over the edge if you're at all prone to vertigo," he adds cheerfully.

"Yeah, um." He looks a bit queasy. "Figured that out."

Anthony probably cannot see Kel's smirk.

Onwards!

Anthony's careful to keep his eyes on the path ahead after that. He considers looking to Dayo for reassurance, but chooses not to, not wanting to stop or risk losing his balance.

That's a good choice: the path gets narrower as they go on. Not indefinitely, but noticeably.

"Careful now," Kel says. "It'll fork up ahead."

Nod. "Which way will we go?"

    "Oh, changes each time, you have to learn to get a feel for it."

"A 'feel'?"

    "You'll see what I mean."