When fighting the God King or the big robot in the basement, a loss means the start of a new bloodline without the choice to load from the last save point. In order to restart the fight over after you've already lost (but before the cut scene of your death ends), quit out of the program, shut it down by double clicking the home button and holding down on the Infinity Blade program icon until it gives you a subtraction mark (-). Press the subtraction mark to shut down the program, then restart the program. It will go through its loading screen and start you before the battle allowing you a second chance at the win.