User blog comment:IamJakuhoRaikoben/Chapter 492: Elder Sister and Younger Sister, Review./@comment-4449950-20160705100735/@comment-1359322-20160705181359

Since we've seen Mard create wood, flower etc with his curse as well. I personally view the Plutogrim/Alegria as some sort a plant. Since plants don't immediately die after you pluck them, similarly Alegria may have residue from Mard's curse.