What happens to a destroyed creature with two totem armors on it?
Per the Gatherer ruling (for Bear Umbra, not that it matters really):


  If a permanent you control is enchanted with multiple Auras that have
  totem armor, and the enchanted permanent would be destroyed, one of
  those Auras is destroyed instead -- but only one of them. You choose
  which one because you control the enchanted permanent.