"He turned, saw that Mepiro, Bogyar, Scraul and the others were laughing—laughing because he was laughing, Saubon realized."
"His angular Shieldbearer, Uster Scraul, was the lone defector. Ever odd, he stood with his shoulders square to the spectre to Ingol heaving over the northeastern wall, with only his face turned to the pluming ejecta. However incidental his pose, his look exposed a soul roundly stumped, not by what he witness—the eyes would have to be focused—but by what he did not, by the crushing sun."
"The Knights of the Desert Lion chopped at what seemed a copse of nightmarish trees about him. Saubon glimpsed Scraul turn too late to a dropping cudgel, vanish beneath it, even as Bogyar's battleaxe struck the miscreant's basin skull."
I would guess that we are getting an origin story for this guy's recruitment in Saubon's elite cohort.