...Heavyarms stumbled. No, that wasn't right. Heavyarms... stubbed his toe. There was no reason for it that Trowa could see, except for a faintly rectangular depression in the sand, which meant some sort of cloaked device.
Wrong shape to have been one of Deathscythe's feet, even ignoring that there was only one depression and that he seemed free to step around it.
So, something else had cloaking technology. Trowa should investigate this, unless his passenger already knew.