"Game of Thrones" Season 7 Episode 6 will have a runtime of 72 minutes, making it the longest episode in the series. Judging by the teaser preview that HBO released, we can easily hope for the best episode in "Game of Thrones" history with particular emphasis on the scenes north of the Wall. With that in mind, let's break down this teaser preview shot-by-shot in the hope that we can unravel some mysteries.

The first enemy and the last

"Game of Thrones" Season 7 Episode 6 begins with Beric Dondarrion saying how death is the "first enemy and the last," while the Hound sees the arrow-head shaped mountain that he saw in flames in the Season 7 premiere.

This is obviously where all the h*ll will break loose as we see the squad in a circle formation in the middle of the ice storm that the enemy brings.

Before jumping into further analysis, let's stop for a second and analyze that look on Jon Snow's face. Remember, this is the man who has seen everything. He has witnessed the Night King and his army at its full force, the resurrection of the dead and all the horror and destruction that comes with it. So this scared look can only mean that he just saw something he has never seen before.

The look on Jon's face, along with a growling sound we hear throughout this trailer makes me think that there is some kind of an animal in the undead army - a polar bear, an ice spider?

Judging by the "A Song of Ice and Fire" books, it's entirely possible. Of course, Jon Snow could just be overwhelmed by the size of the army, but I highly doubt it.

The death of a beloved character?

As the fight continues, we see Tormund wielding an axe, Gendry charging with his hammer, and Jon Snow fighting a White Walker. What scared fans the most is the fact that the Hound is fighting with a hammer at one point which probably means that Gendry is dead.

Given the fact that "Game of Thrones" has a history of bringing long lost characters back only to kill them off in the next episode, it is entirely possible that we could see the death of our beloved Gendry.

Then, after the brief shots of Beric with a fiery sword and the squad running from the wights, we finally get to see the Night King walking like a boss, and that probably means that he has got what he was looking for.

What are you scared of?

This is the very question Arya is asking someone in this trailer and as we see Sansa looking scared we are led to believe that Arya is talking to her. Nevertheless, she could also be talking to Littlefinger, and if this is the case, we might see the last of him in this episode.

"Game of Thrones" Season 7 Episode 6 will air on Sunday, August 20 and you can see the promo down below.