I'm sure we're going to get a flashback to explain that.

Tenzin is notoriously bad at reading people's motivations and emotions, though. He's a spiritualist, not really much of a people person.

Explicitly stated? No, but it's heavily implied. I mean, he certainly wasn't reading up on the subject during his 13 years of being imprisoned on a tiny mountaintop in a windowless cell.

Well, she's Tenzin's sister, and Tenzin did help capture him in the first place. I think my theory is sound, though.

True, but I feel his motivation is coming from something he perceives as a betrayal by the previous Avatar, something more personal.

Zaheer has got to be formerly one of Aang's air Acolytes. That's the most rational explanation for both his knowledge of Airbending, and his quick mastery of its use.

So basically it's a game of Civilization V.

Blink and you miss it John Constantine cameo in the big crowd scene, too.

Well shit, of course it is, your name is Drinking with Skeletons.

BPRD?

It's Bob's Burgers. It would have to electrify the shark and give it spikes.

Oh come on. "Dick Dynasty".

….what?

Fear Tech

I thought it was more of a Marilyn Manson look.