Thor | Loki
Thor was in his element. He was a warrior. There was little that made him feel more invigorated than being on the battlefield, fighting for a noble cause. His good deeds, perhaps more recently, were a bit more selfish. Fighting the good fight, helping others who needed it on the other side of the doors -- well -- it was a way for him to try to redeem himself of his failures or at least to keep a grip on his sanity so he did not completely spiral downward into the pits of his despair over his losses (of which he still claimed fault, no matter how right Stark had been, or Rogers, or Loki for that matter). But selfish or not, it was still helping people so he didn't think it was the worst thing in the world.
In this case, Thor wasn't sure if they were helping anyone or not but he felt pretty confident that ridding a place of violent creatures who attacked pretty much anything that made sound was giving aid to any innocents who might dwell in this realm. No sooner had he called out to Loki to join him did more come running at him, snapping their teeth. And just after, he and Loki stood back to back fighting them off. The stabby motions Loki made gave Thor such a thrill. In the few instances Loki had joined him in his mission to help others who needed it through the doors, nothing made him happier than when they worked together to take down whatever foes they faced. The same could be said now.
By the time it was over, by the time they found their way back to Thortopia, Thor had wrapped Loki up in his arms and embraced him, filled with adrenaline and enthusiasm from their victory. He kissed him a time or two, or three, or a half dozen. "Come, brother. Let us feast and recount our adventure to all those who dwell at Pancho's."