Bucky's strong and could shred the fuck out of these HYDRA soldiers-- but they have an innocent hostage. They promise not to hurt the hostage, if Bucky gets on his hands and knees and takes them all. Bucky is furious and humiliated, but complies. This could be in the prison factory or post-CW, but either way, it's Bucky, not the asset, doing this.
Bucky takes it for someone else