Sozin's Comet is only three days away. Zuko tells the others what the Fire Lord plans on the day of the comet and the gang realizes that they must stop him before then. But Aang doubts that he can do what is expected of him.
Did You Know?
There's one technique you need to know before facing my Father. How to redirect lightning. If you let the energy in your own body flow,
[He stretches his left arm out and the fingers on his right hand touch the fingers on his left hand and swiftly traces a path down his arm, shoulder, stomach and back out the other side
... the lightning will follow it.
[His left hand touches his right, they are parallel to each other
You turn your opponent's energy against them.
That's like waterbending.