As soon as Alessia stepped on the magic circle, her eyes got flashed with a bright white light and she had to close her eyes. Then when she opened her eyes again, she found herself in the middle of forest. She immediately understood that now she was inside a dungeon as the atmosphere of this place was dangerous.
She immediately became focused and took out her sword. Then she called out to her friends and looked back. Then to her surprise, she was unable to find anyone around her. Seeing this Alessia immediately became a worried and started looking all around her. She even tried to focus on all her senses to see if she could sense their presence.
But after trying everything out and not having any result, Alessia realised that they all had been separated. Obviously as that magic circle was something that Elena had prepared, this whole thing was her plan.