So many theories about Pepper or Valkyrie or Nebula saving Tony have come out of this trailer. How easily people forget. Remember, as Matt Murdock said:
‘ You could drop Tony Stark naked in the middle of the desert and he’d fly out in a jet made of sand and cactus needles. It’s not his stuff that gives him power. It’s his brain.’ (Daredevil 2015 #2)
Tony is in the equivalent of the cave in this trailer. He has no armor, he has no tech, he has nothing but the scraps of a ship and his brain. He is wearing the same tank, with the arc on show, that we see for the very first time in the cave in the original Iron Man. There is a reason for that. This is Tony at his most stripped down, at his most vulnerable and desperate. This is Tony, again looking to survive. Tony has no armor. Tony needs to build armor. He needs a suit that will get him home. A suit that will kill a Titan. A Godkiller armor. He needs tools and a forge.
Tony Stark isn’t going to sit and wait. He will fight to his very last breath. Because that’s what heroes do.