Of course, the servitor's first impression was entirely accurate. The marine was not about to be crushed by the masonry. It may take him a few moments or a few minutes to free himself, but his ceremite was ample protection from the bludgeoning.
Fortunately for the Orks, fortunately for the servitor, they listened to reason even if it may have been the echoes of survival beneath his words that truly swayed the green-skins. The servitor did know the way though, or at least he could still access the maps from the Imperial Guard central command. He took the four green-skins out into the dense and seemingly endless forests of Forasev where they would be safe, for now.