Mako was just in Fire Ferrets. Fighting the Wolf Bats in the finals of the Pro-Bending Battles. While he was throwing fire at the team he knocked them down. When he looked to his left to see how his brother, Bolin was doing he suddenly got hit. He got hit in the shoulder and he fell off the battle field, causing him to fall into the water. He grunted

Mako:”Jesus!”

He swam out of the water to head to the elevator*