As if on cue, Dean received another message from Sam as soon as Lisa's sentence closed - this one stating 911. He wasted no time after that throwing his bag over his shoulder and striding to the door. He opened the door without hesitation, but looked back at her as he passed the threshold.
"I'll bring him back. Don't worry." A thought meant to reassure them both, though he wasn't sure how much it helped behind the urgency in his voice. The door clicked shut on the tail end, the sound of his footsteps echoing down the hallway until they rapidly faded into silence.
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A little over three hours later, Dean's return to the apartment was signalled by the slowly growing sound of a dragging corpse. It was followed up by the thud of his weight falling against the door, once he finally reached it. The hand that just dropped Sam's body reached for the door knob, but it waited there as he tried to catch his breath and find strength to push it open. It was as if his body was in protest now that it knew it had reached it's destination. Even once he did get the door open, all he could do was collapse in the doorway.
"Lisa?" He tried weakly from his position, leaning back against the frame of the door and pulling his knees closer to his chest. Though, instead of looking for her, his eyes closed against the sudden wave of emotion that threatened to take over. With none of his executive function skills working, he vaguely decided that if she didn't hear him, he would just take a quick nap right where he was and find her when he woke up.