This is the relevant reference from the Books where Spear Gambling is mentioned.
I make no pronouncements on these matters, but report them as I find them.
Arrive at your own conclusions.
I wish you well,
As I watched, the Tuchuk took his long, slender lance and thrust it into the ground, point upward. Then, slowly, the four riders began to walk their mounts about the lance, watching it, right hands free to seize it should it begin to fall. The wind seemed to rise.
In their way I knew they were honoring me, that they had respected my stand in the matter of the charging lances, that now they were gambling to see who would win me, to whose weapons my blood must flow, beneath the paws of whose kaiila I must fall bloodied to the earth.
I watched the lance tremble in the shaking earth, and saw the intentness of the riders as they watched its slightest movement. It would soon fall.
"Ho!" I heard, and spun to see the black lance fall and scarcely had it moved but it was seized in the fist of the scarred Tuchuk warrior.