Ok so his right eye is blacked so that means whoever hit him used their left hand. Steve is right handed so it's plausible that in the TV spot where Bucky tried to shoot Tony he punched him with his metal arm, which is his left arm
Very well put. It's not right or wrong or good or bad. It's hurt and fear and need and family and damaged people doing the best they can for the damaged people around them. It's ugly and messy and painful and real.