Lamia- Kills a cat

There was a blur of motion from my right. Just before the creature reached me, something collided with it and swept it away. I turned to see two beasts locked together in a life-and-death struggle. One was the huge cat pawing the air, its talons frantically seeking flesh while its jaws roared forth its fury. The other, covered in blood and vaguely human in shape, sat on the back of the cat, both arms wrapped around its neck. At first I thought it was trying to strangle it but, as it forced the head further and further back, I guessed that it was trying to break its neck.
There was a loud crack. The roaring ceased and the beast went limp. Trembling with fear, I watched the monster that had slain it clamber to its feet. What on earth was this terrible beast? Would I be its next victim? I thought as I stood there, frozen.

BW C27