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"What are you doing?"
Tony jumped in surprise, sending his tower of bottles crashing down. He looked up to see Winter looking down at him severely. Of course, Winter always looked severe. "I was building a tower, what did it look like? It's not like I was in your way."
The door to the hallway-- located behind Tony-- opened and closed. He recognized the beat of Bucky's footsteps, and if that wasn't enough, he definitely would've recognized him from his humming. "Oh, hey guys," he said, sounding upbeat. "Whatcha doing?"
"Team building exercise," Tony said dryly. "It's not going great."