As Piper is nearly ready to relinquish her powers, Cole attacks the Source repeatedly with energy balls, eventually wounding him, but as he attempts to kill the Source his attack is blocked by the Source's Oracle, who dies so the Source can escape.
Cole attacks the Source repeatedly with energy balls, eventually wounding him. Piper is nearly ready to relinquish her powers. His attack is blocked by the Source's Oracle. He attempts to kill the Source. The Source's Oracle dies. The Source can escape.