What happened after Ruby fell into the hole filled with water? The hole was dug by humans.

Contrary to Bob's belief that Ruby was captured, she reveals that the humans saved her and brought her back to her family.

“… and they saved me,” she finishes in a whisper.
Bob blinks. “They saved you?” he repeats.
“When I was finally out, everyone cheered,” Ruby says. “And the children fed me fruit. And then all those humans led me back to my family. It took the whole day to find them.”