The Boiling Rock and The Airbender?

Ty Lee and Mai's daring escape from the Boiling Rock creates a rift in Azula's plan to ascend as the new Fire Lord

In a desperate attempt to flee, Ty Lee instinctively taps into a latent ability she never knew she possessed-airbending. This newfound power surprises both her and Mai as they narrowly evade Azula's clutches and seek refuge on Ember Island, the birthplace of their loyalty to the Fire Nation.

Ty Luko fanfic