The sphinx is apparently at least minimally merciful and swings its right claws across the girls throat, spraying blood several feet across the beach and nearly severing the girls neck, revealing dozens of tendons and blood vessels which spray for a few moments in the air before stopping. In fascination and horror you just stare silently, despite Sarah's screams of terror. The sphinx looks satisphied, and is licking the blood up from the inside of the girls throat.
Once it is finished its sensual licking it decides it's time for business. It pins the girls body down with it's legs and then grabs the girls head with it's powerful jaws, ripping it off of what was left of the neck and crunching down. With a terrible crunching noise followed by a sickening squish the girl's head is squeezed in half, brains spraying in the monster's maw and all over the ground. The scalp and side of the head tear off, and the sphinx swallows the rest with a determined force, It then looks back down to the decapitated bloody, covered in blood already, and grabs the collar of her leaf dress with its teeth, then pulling its head back, ripping the dress of and revealing the girl's slender, dark, body, nipples, belly button, and vagina all.
The creature throws the dress to the side, and goes back to work, grabbing the chest with it's teeth, and yanking it's head backwards, ripping the outer skin and muscle straight off the skeleton. The beast chews on the fleshy membranes it just tore for a few moments before thrusting all of its weight into thrashing, biting, and tearing apart the internal organs of the native.
Suddenly you hear a thud and turn to see that Sarah has...