That opening scene in Wakanda with Bucky and Ayo was quite possibly one of the strongest emotional and most well-acted moments in all of the MCU. The use of the flashbacks from the all the films Bucky has been in was used to powerful effect, and his acting chops were Emmy-worthy, especially the look up he gives to Ayo when she says "You are free", as if he's making sure he is, just before she says it again to reassure him. Powerful and moving stuff.
Also props to Wyatt Russell for being so dedicated to a character that was slowly going off the rails. You could tell in every scene he was in that he was visibly twitching or shaking some part of his body, or looking very anxious, sometimes very subtly so, but it just adds to how slowly and steadily he was changing, especially after taking that last serum. He is full of angst and shame, anger and fear, but as others have said here, he was thrust into an impossible position, and sadly, he's used almost every opportunity he's had to look good and ended up looking worse. That final shot of the shield is definitely one of the scariest in all of the MCU, just for shock factor alone, but it really kind of speaks to the idea that a weapon and symbol in the wrong hands, regardless of how noble or powerful it is, can still become tainted, and sometimes all it takes is one bad thing to set someone off.
Gotta pour one out for Battlestar, though. It sucks that he had to go, but I understand that it was for the sake of getting Walker to the point he ended the episode at. Ironic, that the guy Walker kills, was a fan of Captain America because his grandfather also faught in WWII against the Nazis, but he ends up being killed by the shield he probably grew up idolizing.
I cannot imagine how things will go as we enter the third act (episodes 5 and 6), but there's a lot to wrap up in these last two episdes: Who exactly is the powerbroker? How will Sam and Bucky get the shield back (as seen in promotional trailers)? Will Torres ever come back (and become the 2nd Falcon like in the comics)? Will we see old-man-Steve on the Moon?
-Marc.