You, Percy, and some other half-bloods were fighting the army. Both Percy and you were back-to-back, fighting off the enemy, but Percy wasn't getting injured, thanks to the curse of achieves. You could get injured, very easily.

Percy heard a wince and felt her fall to the ground. He looked at her, and his eyes widened in horror. You had taken a knife to protect him. Feeling anger boiling up inside him, he protected guarded your unconscious body.

"NO-ONE TOUCH HER!"