Zhao's cameo was amazing and sad and hilarious, and it was a total dick move that Tenzin didn't help ALL the people out of that prison, even if some of them deserved it for punching fish unprovoked. So it's my head cannon that Zhao stalked Tenzin out of there USING HIS AMAZING TRACKING SKILLS and now Tenzin has to drag him along on stuff. C'MON TENZIN BE A BRO
Just imagine all the fog!Zhao hilarity, tho...
Zhao: I HAVE YOU NOW AVATAR!
Jinora: Lemme go!
Zhao: AND--you're a girl now? Well, won't Zuko be relieved.
Allllso my favorite thing about the fog prison is that is gave Zhao CRAZYBROWS. That's how you know it's intense!