This is a simile as it compares two things using the word like. It compares her running across the grass to a cheetah chasing its prey, implying she is running very fast
You could say the character has lots of integrity. which means that you do the right thing under any circumstance. Idk if this helps
"The Cossack as the cat; he was the mouse. Then it was Rainsford that knew the full meaning of terror" is the best detail that supports that claim.
