Panthers got cocky for no reason, and kept doing their failing running plays to run the time out. In the end it certainly barely won the game, but with all that time the defense played it got Kuechly injured. Drew Brees averages a ton of points per game, so it is no surprise that he could make such a comeback.
Either way with Ingram and Kuechly out, both teams will most likely stay where they are at the bottom.