For four years Ardyn kept his group safe. Four long years, and he was betrayed by a new survivor that he took in out of the goodness of his heart. He would have been no better than the government if he didn't take in the two survivors that had shown up at his group's base. Ardyn should have been suspicious of the fact that one of them was bloodied and appeared to be injured, while the other was scared out of their mind.
That should have been a red flag to him, but he didn't think about that at the time.
Now, Ardyn had been betrayed by none other than the ones he took in. Having gone out on a supply run with one of his men and the survivors they brought in. Along the run, he got injured protecting them. Just when he was about to climb a ladder to the safety of a rooftop after making sure his group members got up safely—his hand was stepped on. With the addition of his injured shoulder, his grip weakened and he let go.
Landing right on his back from some stories up, and leaving him with the wind knocked out of him.
It looked like the end for him with the horde of zombies gargling and snarling to get at him from below. His vision went blurry and he abruptly passed out. When he awoke, he was in an unfamiliar room and on a mildly comfortable bed. It wasn't the infirmary of his group's base, so he must have been picked up by somebody…