He still remembers the weight of Jill against his palms, as he hoisted her up and threw her over the divide. He still remembers her fingers brushing his while exchanging ammo. He still remembers the warmth of her body, the feeling of being shoulder to shoulder and simply knowing she was only a few steps away from him. Her presence lingers, this phantom ache, throbbing numbly. It reverberates through his skin and sinew, down to his core.
Jill can't be gone because Chris still feels her there, right beside him.
