Abraham says that Nightwielder knows him by sight, so that they must avoid encountering him if possible, and he goes to try to use a tensor to dig an escape tunnel in a remote part of the corridor from the "entrance" to the store. David wields Abraham's gun as Nightwielder and several Enforcement officers appear. They are disappointed in what Diamond shows them, and Nightwielder notices a blank space on the wall where the gauss gun was, and inquires about it. Diamond tries to claim customer confidentiality but then Nightwielder is distracted by a noise Megan makes. David tells them to continue and that he was going to improvise to create a distraction.

-Summary
http://coppermind.net/wiki/Steelheart/Summary#Chapter_1