Can you describe 3 tricks that rainsford used while being hunted

1) Rainsford moves in a path intended to confuse Zaroff. He winds around and doubles back, walking (running) in loops. This attempt to lose Zaroff is unsuccessful.

2) Rainsford's first true trap is what was called a Malay mancatcher. He made the trap by balancing a dead tree upon a cut living tree. One of the boughs is then set as a trigger for the trap, which when set off would cause the dead tree to fall.

3) There was also the Burmese tiger pit. This trap was created by digging a hole in the Death Swamp and filling it with stakes, which were then hidden by woven grass. One of Zaroff's dogs is killed in this trap.

4) Rainsford's final trap was a trick he'd been taught in Uganda. He fastened a knife to the end of a young tree (the youth of the tree would have made it pliable).

"He thought of a native trick he had learned in Uganda. He slid down the tree. He caught hold of a springy young sapling and to it he fastened his hunting knife, with the blade pointing down the trail; with a bit of wild grapevine he tied back the sapling. Then he ran for his life."

Why is a girl there was never a girl in the passage.