(I'm going to timeskip S2 to s3 because to me s2 is boring)
After the result of unalaq destroying raava connection with the Avatar and korra defeating vaatu and leaving the spirit portal open, the rise of airbenders has spark team avatar to go and gather them all to once again bring back the air nomads
Meanwhile, in a white lotus prison
White lotus guard: alright zaheer you know the drill
Zaheer: yeah i know hands up and face facing the wall
While zaheer decided to make a poem of guru lajima he air bended the guard with the keys but before the other Guards could take their stand they were blow away off the mountain when both the guard and zaheer saw the man infront of the only for zaheer to remember who he is
Zaheer: i thought you were death
Little brother
Cain: same here i been trying to locate your prison but the white lotus kept moving the guards who had your location until i kill one that was the last guard who was watching you
Zaheer: i see
Zaheer snap the neck of the white lotus and cain metal bends the cell and free zaheer