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“A gunslinger! I told you, Mercy! I saw the shooting iron and I told you!”
   — Si

Si is the husband of Mercy and one of the first people the ka-tet meets on the River Crossing in The Waste Lands. He assures his wife that the ka-tet are gunslingers, not harriers. He then leads everyone to the town, and gives the ka-tet an introduction to the town and it's residents.

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