How could there be a green flame in the world?

While Granny Rafflesia and Lilo were surprised at the scene, Dewey waved his hand. The green flame started to move toward Granny Rafflesia.

Even though it moved slowly, it managed to startle Granny Rafflesia. She flashed backward and yelled, "Lilo, get out of there now!"

Lilo responded and quickly retreated to the side.

The green flame hit a tree. After a booming sound, the tree was covered entirely with green flame. It was burned to the ground