It was the final battle, and everyone was fighting powerful wizards, and one by one everyone was slowly gaining the upper hand, but then the enemy just completely took everyone out, and Lucy was the only one standing, and you were nearly dead, so in an act of stupidity, you gave her the remaining power you had, including life force, so she could cast a spell, which she does, wins the battle, and rushes to you.

"It should've been me; you were always stronger!"