The Elf Queen had passed out. Her powers and vitality were leaving her body at a very fast rate and if she was left like that, she would end up dying.
Seth felt the Evergreen Essence leaving her body and it was the last mystical force maintaining her life signals. If it were to disappear, she would die by the huge quantity of internal injuries her body had at the moment.
But instead of panicking, a green light appeared around his finger and he pointed it towards Arwen. The Evergreen Essence that left her body swiftly returned, energizing her cells once more.