A recent episode of the “The Rookie’ shows one of the characters showing his last resort knife to his training officer.  It resembles a Benchmade 175BK push dagger.  It’s a short story arc that helps support the longer main arc.   
Still, one can see why real LEOs will carry a last resort weapon.  They don’t have a room of script magicians to write them out of the problem.  These weapons are usually very simple to use.  Any tool that requires year to learn and five years to master will fall outside the definition of ‘tool-of-last-resort.’

Karambits have this tool potential.  The ordinary user can slip his little finger onto the loop and hold it in a hammer fist and simply claw his way out of danger.  Placing your thumb on the back of curved spine will give you a little more feedback.  Are we not trained to touching things with our thumb?  The same almost autonomic reflex helps guide the blade.

Held in the reverse grip, the blade juts out of our fist like a prehistoric claw, perfectly situated for close infighting moves. Small wonder folding karambits are so popular.  Closed, they are easy to conceal, a basic impact weapon and open, it becomes so much more.

In the hands of someone with more training than I, the karambit has multiple applications.  The dull spine can be used use to trap and control opponent’s arms and balance, making a range of other physical responses available.  The razor edge lets you transition from physical control to higher levels of force almost instinctively. 

Folding karambits have some problems.  Opening isn’t always easy and fingers can get in the way of the edge.  Lock and pivot points wear and fail from applying load on the spine or side of the blade.  All knives direct the load into the handle but the twisting load generated by using the blade as a control device can cause handle failures.

Joe Caswell, karambit
CRKT’s Provoke, designed for LEO and people in dangerous places

Many of the devices used to open the blade as you remove it from your pocket don’t assist you opening the karambit if you are holding it in your hand as an impact tool.

CRKT has taken Joe Caswell’s design and produced the Provoke It is a unique knife that may change how we open and close folding knives.  Your fingers are never in the path of the blade when opening or closing.  The blade is firmly locked in place by two stout arms.

closed Provoke, knife, karambit
The front of Joe Caswell’s innovative folding karambit 

The problem is opening from the pocket draw.  The optimal opening has the index finger through the ring and the dull spine against the palm of your hand.  The thumb presses the back pivot point and the blade pops open.

Caswell, folding karambit
Back side of the Provoke.  The clip holds the knife deep in the pocket.  What you see doesn’t look like a clip.

Here’s a right and left hand draw with opening showing the finger movements I use.  It looks clumsy when shone slowly to reveal finger movement.  It’s not.  Practice for ten minutes and it will feel completely natural to you.

Left side opening.  I needed to pivot out of the camera view to show the opening.  You really don’t hold it like a soiled tea bag. 

Right side opening.  The knife must slide from thew thumb to the index finger

It’s not an inexpensive knife and has limited general application.  Its cutting edge design and manufacturing has built in a high degree of reliability.  It is last-chance-tool to claw your way out from under the casket lid. 

Find yours at  MSRP is $200.00.  Cheap at that price.