i headcanon that bob has brain damage due to a combination of abusing substances from such a young age (12) and repeated head trauma from domestic abuse. the sentry experiments did not fix it and this (alongside his mental conditions) why he struggles with memory, tremors, and focusing/information processing in particular.
of course bucky suffered brain damage too after decades of hydra’s horrific abuse and he picks up on some of bob’s issues because he’s experienced them firsthand. i like to think that it’s something they can quietly support each other with











