The Witch of Flesh and Carnage Edora could not believe that she would show her weakness to Adrian. She thought that the demon was just a youngling that does not know much of the world and is only strong because he was born a demon, but she is mistaken. The demon before her utilizes everything in his power to obtain victory which is why she is now sure why her disciple loses.
When the Witch of Flesh and Carnage Edora is feeding on specimen, she usually stretches her own flesh body in order to absorb them. She needs two whole days in order to fully devour a village worth of people. This state is also the one where she is at the most vulnerable.
In her 'feeding' state, the Witch of Flesh and Carnage Edora is almost defenseless and all the damage that she will receive is doubled. She could cast the flesh barrier that she used earlier but that would mean that she will lose precious time of her feeding. She grows stronger by devouring other beings after all.