k just some complaints...
Animation was good, i wasn't lost in the speed, but it was a bit jerky between the camera movements, so just work on that as well as smoothing out kicks or swings, in real life a sword would take about 1 second to go from starting position where the swordsman is standing at rest with the sword pointing up, to the finishing stance where he has swung and the blade is now facing down, the tip near the ground. This is still fast, but its a noticeable difference. Second, if a ninja has been exposed to the enemy, like the start of your flash,
A) he isn't a ninja,
B) he was previously engaged with another ninja, and is now showing wear from battle
C) he became a ninja to assassinate that person, and at the last minute decided to make it a fair fight, therefore see point A, because everyone knows ninjas don't seek vengeance, they seek peace, through quick painless deaths to those who cause violence.
So while the fight was good, your background needs a little work.