He was complacent in the face of the skill of the Ninjas.
Thank goodness for the Energy Ninjas, who are here to show you lots of ways we avoid wasting energy !
To beat Ra's Al Goul at the end, you must beat all the ninjas around him.
The warriors range from ninjas to swordsmen to odd guys dressed to frighten you.
And of course, it only helps that ninjas are the epitome of badass.