Warrior jumps to other end while behaving as if still at first end

[auno]

In level 7, the following code will cause the warrior to seemingly jump to the other end of the level, while still taking damage and attacking as if it's still back at the first end.

class Player
  def play_turn(warrior)
    @counter ||= 0

    case @counter
    when 0
      warrior.pivot! :backward
    when 1
      warrior.pivot! :forward
    when 2
      warrior.walk!
    else
      warrior.attack!
    end

    @counter += 1
  end
end