It’s obvious, even to him, that the rest of the “team” is trying to distract him.
Barton and Stark keep trying to engage him in conversation over the most bizarre subjects and while Thor humors them by replying occasionally, he doesn’t really put much energy into doing so.
Banner approaches him when Stark and Barton get into an argument over weaponry, and casually insinuates himself into the conversation. At least this one isn’t so transparently fake. Thor knows the rest often see him as a bit slow when it comes to adapting to Midgardian customs and dialects, but he isn’t unintelligent. Banner seems to be one of the few who respect that.
Thor smiles as the scientist pats his arm and offers him a drink. The god accepts with a gracious nod, then glances up as Banner is called away by Stark, presumably to weigh in on the argument still taking place.
That’s when Thor glances out the window of the war room.
There is a small army of armored SHIELD soldiers marching through the hall across the room and in the middle of them, shackled and bound, is Loki.
Thor freezes, every muscle in his body locking up.
“Shit,” a distinctly female voice distantly registers as he sprints across the room, throwing himself against the near-impenetrable plexiglass. He would use Mjolnir, but that would most certainly not be taken well by Fury or any of the commanding officers.
“Loki! Loki!” Thor screams, throwing himself against the barrier repeatedly until cracks begin to spider-web outwards from the central impact point.
His not-brother glances across the room, a serenely confident look on his face. The trickster meets his eyes, then smirks privately, an ugly promise glinting in those haunting green eyes.
Things are about to get very violent and Loki has no interest in prisoners. He continues walking, lets his gaze fall from Thor’s, maintains an almost docile disposition in spite of the fact that he could have slipped free of those pathetic excuses for restraints the instant the soldiers captured him.
Thor snarls incoherently, bashing himself more violently against the plexiglass. “Loki! You cannot do this! Someone stop them! Let him go! Release him! LOKI!!”
(Source: black-nata, via brokenheartedfestivities)