Level 4 technique of the Sparrow clan

I think that the Level four technique of the Sparrow clan bushi technique is Fuel of the Fire.  Basically, when a Sparrow whenever is angered they will direct that anger into there actions.  Allowing them to perform at a level that they would normally not be able to.  In that the, anger is the Fuel of the fire, it is what gives the technique it's name.