Yammo was the first to notice Link; she'd been watching their surroundings more, had more practice being aware of where monsters were or might be, and anyway, she'd told Zumi to feel free to enjoy their surroundings. Yammo was more likely to get to go out that way sooner than Zumi was, after all. May as well as enjoy it.
She tapped her partner's shoulder and pointed towards the approaching Link when she had her attention. "I wonder what's going on."
They met him halfway. "Are there problem spots coming up?"