Ivan
She wasn't really there.
Her spirit wasn't egging him on or possessing the weapon. It was just the memory of her surrounding him. Unfortunately, instead of calming him, it was making him angry. The bow fed on that emotion, increasing the power of each attack, and that only served to make Luke more furious when he saw the damage he was causing. It'd become a vicious cycle.
"Soldier! You need to stop!" I order, using mind-link and my voice, hoping to get through to him. My hand squeezes his, struggling against his strength. "Damn it, Luke. You're going to kill us both."