Sentence:  "...on one end known as a Bardon choker hook, to facilitate making a loop. It stays tight and makes it unnecessary for the "<WSD>chaser</WSD>" or "choker setter" to follow the "turn" to the landing as might have to be done if tongs are used" 
Meaning of the word marked with <WSD> tags:  Someone that follows logs out of the forest in order to signal a yarder engineer to stop them if they become fouled (also called a frogger).