And bam, it's as simple as that. I felt like when watching Noland he was locked in on 1 WR and wouldn't progress through his reads. Now, granted he half the time couldn't get to those options because he'd be sacked by then. It's as simple as Brock using his feet and fakes to get his positioning or buy himself time to allow routes to open up. He emphasizes the details and helps himself out by doing so.
Well, that, and the fact that the pass rushers didn't care one bit if they lost contain, because not much bad was going to happen. They'd just pin their ears back and go.