Slim Says: Walt never knew what Gus knew about him. Walt was lying to him, he's supposed to be in the lab cooking up shit. He's telling him he had to run errands and it's Gale's fault we haven't met our quota. Gus showed up to the place, to Walt's surprise, he's meeting up with his family and shit. It had to be shocking: he's helping the DEA, getting him food and donating shit to him or whatever. I'm sure Walt ain't know none of that. It had to fuck his head up, 'cause he's running around thinking he's slick. Thinking Gus don't know his brother is a DEA agent, but come to find out he knew the whole time."