(This article contains spoilers for the season 6 finale of “Fear the Walking Dead.”)Now that is follow-through.During this entire story arc with Teddy’s doomsday cult, I never really thought the nuke was truly a threat. But I held out some small hope that the bad guys would succeed, that they would deliver a massive jolt not to just “Fear the Walking Dead” but also to the entire “Walking Dead” TV universe.And they did it.