Well then. That was about the breaking point, people he knew or wouldn't knew. It made sense, really, for having all of nothing and accepting truths about oneself. To all of a sudden have a barrage of people who would have known and cared for him. Not remembering the unfolding events leading to such things.
Not wanting to cause alarm or wanting Bucky to feel badly for breaking the glass--given he was only showing whimper face over sitting down a few moments ago, Loki spread his fingers and dispatched his magic, picking up the pieces in a reverse manner to replace the bottle as it was before. Yes, yes, fixing everything with magic was against his current credo but guh, circumstance. No use crying over spilt milk, er, soda.
"He was your friend before they took you. You had a lot of those." Or so Loki would have imagined. If he were Steve Rogers' bestie, then the man had to be something special, nothing like a killing machine. "Remember--Prisoner of War. Your captives were the enemy, Bucky, not your 'targets'. You've been manipulated."