So, doing my run in the factory, I entered the room right before the Strum fight (The dude with the motor for a chest/head) after the Heisenberg talk and immediately back out to go find other stuff before progressing the story. Came back and Strum never popped out of the wall and the fight never happened, I just proceeded normally. Will try and re-do it from a save point later to try and get a video of it