The show has always shown Walt act impulsively and do some crazy shyt when he's angry or ego trippin'.this exactly.
Walt wasn't there to kill mike.
walt was there to try and get mike to say he did SOMETHING right after damn near 3 seasons of mike constantly putting him in his place for everything.
He took the gun because he was scared of mike, plain and simple.
Hell, if he wanted to kill Mike, he just would have brought his own gun with him and killed mike. It's not like we haven't seen Walt shoot nikkas in the face before....
I think that cats is so busy rooting for the bad guy and wanting Heisenberg to buss his gunz and ride on his enemeez that they're missing the obvious.
Walt is an incredibly intelligent but incredibly small and scared little man who's every decision is driven by his ego.
him taking the gun and killing mike is really no different.
This is the same guy who blew up a guys car because he took his parking spot and was talking loud on his phone in public.
The same guy who went to Ted's job to fight him after he found out he smashed his wife.
The same guy that tried to fukk his boss just to get even with Skylar.
The same guy that sped into one of Gus' restaurants strapped ready to kill because he didn't know where Jesse was.
The same guy that walked up to some random cooks in a parking lot and told them it was his territory.
It's clear Walt acts on impulse for a lot of shyt that he does... him killing Mike was another example of him getting mad as fukk, and acting on it without thinking things through.
Plain and simple