From what I read, all 4 lasers were on the same FB3, therefore couldn't do anything other than do the same as each other. You can assign zones to different FB3's but not specific projectors on the FB3
This is why I'm confused how any of the lasers managed to display the first frame for the duration, when the signal coming from the DAC was clearly the whole show (otherwise the projector that worked would never have shown the show)