Alright so I've seen the idea floated around that Zuko and Katara are reincarnations of Oma and Shu respectively. So, what if Zuko being able to jump in front of Azula's lightning so fast was the result of literal spirit possession? Oma saw her beloved Shu in danger from her family again, and she remembered with agonizing pain that not acting quickly or decisively enough got her beloved Shu killed last time and she COULD NOT let that happen again













