the empire of the four elements (The guardians of the four elements)

four friends were playing in the stream as they did every summer until one of them wanted to explore more...

"What is that?" Ana asked.
"she looks like a child and I think she's lost," I said.
"Let's go and see" Andrew shouted from afar as he had already started to follow her.
We all followed her to a point where the girl started to run as if something was going to kill her.
until suddenly she touched a tree and disappeared
We who were behind her also seem to have disappeared because when we opened our eyes we were not in the forest...