Zachary saw the sight of the skeletons skewered on the spikes and pursed his lips, clearly in disapproval of such barbaric idoltry.  Something would have to be done about clearing them away later.  Zachary started concocting the sermon he would be giving later on the evils of paganism and barbarity.  However he was not so distracted that he didn't take a step closer to Emma and Amber as if to shield them from the sight.