All I can say is: what an episode! I didn't see it coming. TD for the most part is not your average thriller; here the violence is implied or occurs between the scenes, there are no pyrotechnics, no car-chases, nothing. Yet it still manages to keep you anxious with a style of its own.
In a way, the first three episode set the platform and the fourth one was where everything went boom. TD has been criticized for its sedentary, drawn-out story telling but I think, this is what makes tonight's episode even more rewarding. We have been treated to excellent character development, philosophical monologues and an endless barrage of nihilism from Rust but there was nothing in TD that really got your heart racing, until tonight that is.
To be concise, "Who Goes There" is a pinnacle of storyboarding. A lot of ground is covered in this episode that completely revamps the makeup of this series. We see gunfights, chases, comical jibes and some excellently chosen music.
I will really be looking forward to next week's episode and see how the series follows-up from here.
P.S: The final 6-minute, unbroken tracking shot following Rust through a not-so-comfortable situation is brimming with sustained tension. Not since Breaking Bad's final few episodes have I lingered so close to the edge of my seat.