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In The Territory, S notices a guard who is old, fat, and half asleep (p354). Pfeifer tells him that the guard may have had too much wine to drink at lunch and is old and shaky and has very little sense left (p360). But then after the old villagers involved in the plot against Vevoda are gunned down at 4pm, the guard kills Anca and Waqar and presumably the baby in only three shots, even from far away up above the river.  He stands, his hip cocked, perfectly steady, as smoke wisps from the barrel of his rifle (p366).

How can the old and shaky guard with very little sense left be so alert and be such a good steady shot? Did Pfeifer lie about this one thing? Or many things? What is the point of this particular oddity in the book?