The magic circle used by Mari Dundragon was useless for actually identifying curses, because curses were practically undetectable if they didn't have clear symptoms, so some curses were able to grow slowly like tumors.
If the only way to identify a curse was to know its effects in order to be able to act effectively against it, Victor Shieldman was screwed, because he couldn't say out loud that he was capable of returning from death.
For this reason, Mari decided to use a magic circle to infiltrate Victor's soul and memories. Using this method, she could see from his perspective the effects of the curse that afflicted him.
However, when Mari actually entered Victor's mind, she realized that his soul was like a great storm. Multiple visions unfolded before Mari's eyes, transporting her to different moments in the hero's past, important moments within his memories, and at the same time she felt like she was falling over and over again.
