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Arlo, maybe wisely, wanted no part in the conversation between the two women. Though he wouldn't admit it, there were times he was tempted to speak before thinking, and as often as not he let the temptation get the better of him. In this case, a third voice would serve no purpose. And it could as likely result in the owner of that voice ending up on the outs with both women at once. He knew Vega much better, and knew, even appreciated her tendency to be blunt, to say what she was thinking. And Asari had already shown herself to be temperamental to the extent of abandoning better sense, when better sense would have meant equipping herself for the outing.
Instead, Arlo snorted quietly when Vega whispered to him in the half light provided by her own glow. And he wore what could only be described as an irreverent expression. "Go on, admit it. You'd miss me if I wasn't around," he whispered back, no matter her tight smile. Did she really think he'd stay back while she went in alone?
But it was back to the serious business of tracking down a lost child. The young man hadn't realized that Kata had failed to join them, until they were already at the split in the path and had found the sets of tracks. The man wasn't lost, they'd only traveled straight to then. So Arlo could only assume that the man who was meant to guide them, had instead decided to remain behind. A curious choice, but too late to question it. For him, the decision of how to carry on was easy. "I vote we stay together." If they came across something unsavory, the danger for one alone was too great. And it was easier for one to get lost in the dark, than two together when one of them put out just enough light to prevent them being plunged into darkness.
"I'm not sure there's any reason to split up anyway," Arlo said then, frowning down at the tracks in the soft ground. "Choosing one path at random, turning round and exploring the other will be time consuming and maybe it's not necessary. Not when it's possible to choose the most likely one and start there first," he said, and dropped down on his heels to look at the tracks closer. He urged Vega closer, even Lyova who gave off a glow of her own. But no matter how much light the two of them gave off, if there'd been enough light to notice the tracks in the first place, there was plenty enough to examine them now.
It didn't take any kind of expert tracker to tell the difference between prints left by a person, as opposed to those left by, say, a rabbit, a deer or a wolf. Not hard to tell whether they were small prints or large either. "Assuming she came in the same way we did," Arlo muttered while examining the tracks. "Unless she's some sort of magical creature, she couldn't have split in two and headed down both ways at once." He examined both sides of the splits then, to see if there were prints going down both paths, and in the same direction. It wasn't hard either to see whether any given set of prints were coming or going. Common sense dictated that the shape would be different, depending on the direction.
"If she's gone down both of them, then it was one way first only to return and go the other." Which meant that at the opening of one of those choices, there'd be prints headed in both directions, as opposed to the other where they'd lead in only one direction. But if there was another entrance or exit down one of those tunnels, then the prints ought be coming out one split and heading down the other.
It was all of those signs that Arlo was looking for. And last but not least, some indication that something else had gone that way too. Another person? A larger one? Or some sort of creature that also would have left tracks behind. But if examining the tracks gave them a better idea of which tunnel they ought to explore first, then the extra time to do it was well spent. Much less time consuming than choosing wrong at the start and having to come back. So if he learned anything useful by looking, then it was up again on his feet. "So I vote we stay together," he repeated, before offering his suggestion of which way they ought to go first, based on whatever he was able to see.

