Answer:
Looks like water, but it's heat. Sits on sand, lays on concrete. A play on the eyes, but it's all lies.
It's anything but amusing when this body part gets hit.
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see.
With pointed fangs it sits in wait. With piercing force it doles out fate, over bloodless victims proclaiming its might. Eternally joining in a single bite.
I have two hands but cannot clap
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?