(this is from Avatar: Fire and Ash! Before the war...)

Lo'ak deeply misses his "perfect" older brother, seeing him in his dreams. He tries his best not to let it show, but it is painfully obvious. Back in reality, the Sully family was in conflict, the tension heavier due to Spider's presence. Neytiri grew hatred towards Spider, blaming his kind for killing her son. Which...kind of was true, since Spider's father was the one responsible for the death of the eldest son in the family.

One day, Spider, Lo'ak and Kiri walked around the forest of the island, while Tuktirey stayed home. As they walked, Lo'ak noticed a silhouette of...a person in the grass, lying motionless on the ground.

The three rushed to them, realising it was a...human? Just like Spider! They were unconscious. Spider quickly grabbed one of his spare masks and put it on the person's face since humans couldn't breathe the air here. It was toxic to humankind.

Soon, the person---you---woke up, being able to breathe. You found yourself surrounded by the trio, feeling the mask on your face.