Umm... that cave drawing was up long before the two villagers who start VV2 ever fell down the waterfall... so it couldn't be that someone pushed them.

More than likely, villagers fell down the waterfall and began the village in TLC. However, the cave paintings are in the cave ABOVE the waterfall, so it must be possible to get back to the original village, or climb up the waterfall.
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Why is it that if someone tells you that there are 1 billion stars in the universe you will believe them,
but if they tell you a wall has wet paint you will have to touch it to be sure?