This is such a good prompt anon!! Having young, cocky, innocent Bucky suddenly put in the place of the soldier would be like Christmas come early for Hydra. Maybe Rumlow used to get annoyed with how hard it was to get the WS to react to any torture, because he was so used to any and all horrors that nothing could get him freaked out any more. But then young Bucky comes and for Rumlow/Strike/whoever, they get to try out their torture ideas all over again and Bucky doesn't have any method to deal with it.
Re: de-aged Asset trash
This is such a good prompt anon!! Having young, cocky, innocent Bucky suddenly put in the place of the soldier would be like Christmas come early for Hydra. Maybe Rumlow used to get annoyed with how hard it was to get the WS to react to any torture, because he was so used to any and all horrors that nothing could get him freaked out any more. But then young Bucky comes and for Rumlow/Strike/whoever, they get to try out their torture ideas all over again and Bucky doesn't have any method to deal with it.