The Winter Soldier had been trained to arm any of his handlers who are not already armed while in his presence so that, if they so choose, they can put him down at anytime.
Later, it takes months for Steve to realise why Bucky keeps giving him a knife every time they're in the same room.
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Marvel Headcannons
FanfictionAll of these are on tumblr I don't own there The mcu franchise belongs to marvel and the late stan lee