The Hidden Children by Robert William Chambers Chapter 5 Page 48

The Sagamore looked me square in the eye with a face which was utterly blank and expressionless. Then he gathered his legs under him, sprang noiselessly to his feet, laid his right hand on the hilt of my knife, and his left one on his own, drew both bright blades with a simultaneous and graceful movement, and drove his knife into my sheath, mine into his own.

My heart stood still; I had never expected even to witness such an act — never dared believe that I should participate in it.

The Siwanois drew my knife from his sheath, touched the skin of his wrist with the keen edge. I followed his example; on our wrists two bright spots of blood beaded the skin.

Then the Sagamore filled a tin cup with clean water and extended his wrist. A single drop of blood fell into it. I did the same.