You c'n imagine why he was called that.

He wouldn't even risk bein' honest.
Well, Sure Thing watches perceedin's with a good deal of interest, an' he sees Mike disappear 'round a bend of them rapids, his arms an' legs wavin' somewhat wild.
"Then Sure Thing goes up to Lem, an' he sez, 'Lem, have you got a braided linen rope in the outfit ?' "'Sure,' says Lem.

'Why ?' "'It's my turn next, an' I wish you'd use it on me,' says Sure Thing.
'Ye see what happened t' Mike, an' I don't want t' take no chances.

You know I can't swim.'" "Just the same," said Bill Jordan, determined to have the last word, "with all your advertisin' for braided linen ropes, I'll take old maguey for mine, swimmin' or no swimmin'." In the midst of the laugh which had followed Buck's grim tale, Sitting Bull, who had been lying near Whitey, rose to a sitting posture, his cave-like mouth open wide and raised at the corners, his eyes twinkling.
"See Bull!" Bill Jordan cried delightedly.

"He's laughin' at Buck's story yet.