As its name suggests, The Walking Dead: A New Frontier’s fourth episode, “Thicker Than Water,” confronts Javi with the ideas of whether the bonds of blood or friendship are more important to him. Unfortunately, the path getting to those decisions before the strong ending is far less enjoyable than much of this season has been so far. “Thicker Than Water” hurtles forward with the mistaken idea that Joan, the villain introduced in episode 3, is a force to be reckoned with.