That's the bad writing part I was talking about, breh. Why did Walt take that gun in the first place? You guys really expect me to believe Walt thought Mike was gonna kill him at that point?
After spending a whole couple episodes getting out of the game and making that explicitly clear to his former partners in crime, he's going to kill the fukking brother in law of the DEA agent that's on his ass? That's how Mike is going to exit the game?
At that point, Mike was the least dangerous to Walt then he'd ever been. Mike could have genuinely killed Walt multiple times this season already, and Walt never reacted as scared as the normal person would because he knew he had some leverage and that Mike was a reasonable guy. Getting out of the game was not going to magically make Mike reckless enough to kill Walt. I'm willing to say that Walt maybe was pushed to kill him because of his ego in the end, but the premeditation was there as far as killing Mike being an option in the first place. That scene would be executed much better minus the lamentation about being able to get the list from Lydia. That's Walt's true Breaking Bad moment. The forced and illogical remorse does nothing for the scene.