While he watched the entire grand mapping hall move, Waller was partially trying to understand the flow of information. How the hall would function and if he had to help, he would assure anyone would be brought it that could fill a niche position.
He was also clearly resting a bit, everyone had seen Walker sit with a contemplative face knowing that it was both the new magic tool on his mind and also the lengthy process of mapping the entire world in his shoulders.
Besides all this, Mordant and Rise noticed that Walker was subtly pulling a little mana to him here and there. They wanted to sit and speak more but they also knew that they were trying to set this entire place up. For Mordant to be so focused and distracted from the various tasks he had been interested in, meant a lot.