Two young men are selected by the keeper from one of the military societies[14] to scout for a tree to serve as center pole for the dance lodge. While searching, they must refrain from drinking. About this time all those intending to dance are building sweatlodges to purify themselves: the keeper must enter each of these to direct the proceedings; this entails considerable work on him. Should he be sick at this time, the doll is carried into the sweatlodge by the captive in his stead. It is incumbent on the _tai´me_ shield owners to accompany this captive and help him perform the necessary ceremonies. When the tree for the center pole has been selected, the whole camp moves after the keeper and his family to the dance ground. A dozen or more old men follow immediately after him. The main body is guarded front, rear, and both flanks by the military societies, as is customary when a camp moves.[15] The procession halts four times on its journey while the keeper smokes and prays. Next, the soldier societies charge on the dance ground, or rather on a pole erected there before the camp circle is established,[16] according to Methvin (p. 64), but on the newly established camp itself according to Scott's informants (p. 357). The next morning the man who has that privilege sets out with his wife to get the hide of a young buffalo bull. When such a person dies, the keeper appoints one of his kin to take his place.[17] The couple must fast while on this hunt. If the buffalo is killed with a single arrow, it is a favorable omen, if many are needed, the opposite is indicated. The buffalo must be killed so that he falls on his belly with his head toward the east. A broad strip of back skin, with the tail and head skin attached is carried to the keeper's tipi, where feathers are tied to its head.[18]