Carl decides on a suicide mission to kill Negan. Gets him in his sights, doesn't pull the trigger. Walking behind Negan on the catwalk, Carl is handed a barb-wired bat, does nothing. Negan is busy ironing someone's face, Carl and Daryl stand behind with said bat but decide to do nothing. I guess I can understand that Daryl is traumatized by the last time he tried to do something but Carl's entire purpose of this trip was to kill Negan. He had multiple chances and froze. This is from a kid who killed his own mother.