In The Time of Dinosaurs

The Nesk raised the weapon and pointed it at us.
Now, maybe I have to back down before a fifty-foot-long Spinosaurus. But I've faced plenty of pushy aliens with ray guns.
I knew this Nesk character with the ego problem would expect me to charge him, like a dinosaur. But I'm a human. Better yet, I'm a gymnast. So, just like on the balance beam, I spun on one leg and whipped my rigid tail into the Nesk.
<Take that!>
My tail hit hard. It slammed into the Nesk at his chest level. My tail broke him in two. The top half simply fell off. Like I'd chopped through a tree.
<Oh, my God!> I cried, horrified. I'd only intended to knock him down.
But then my horror changed tone. The severed lower body seemed to be dissolving. Breaking into thousands and tens of thousands of tiny squirming pieces!
And the fallen upper body was still holding the weapon. Raising it toward me again!