It says I can use warrior.health, but that doesn't seem to be true - I constantly get player.rb:5:in `play_turn': undefined method `health' for #<RubyWarrior::

It says I can use warrior.health, but that doesn't seem to be true - I constantly get player.rb:5:in `play_turn': undefined method `health' for #<RubyWarrior::Turn:...> (NoMethodError) Not sure if it's supposed to be added in later levels or what, but it's a bit frustrating. This looks really fun.